Hjorlwulf
You have to understand that with Oblivion, Bethesda abandoned the user pool they had with Morrowind -- namely smart "thinker" players -- in favor of a target audience that was nurtured on D&D and other hack&slash games. I think it was a mistake. I would much rather have experienced Oblivion as a thinking game rather than a reaction game, but we got what we got, and we have mods to fix those issues ... or at least many of them.
I had been wondering from my first play through where the standing army is. It all started to make sense as I played the game and discovered that the PC is supposed to solve all of the world's problems, mostly without any help at all from anyone in any sort of "authority". If there was a trained military then there would be no purpose in MQ for sure, and many of the minor quests would likely be taken care of by the local police or wandering legionnaires. Bethesda basically sacrificed any claim to "realism" in this game to the "unwashed masses" that they are apparently trying to get hooked on Elder Scrolls. It probably doesn't bode well for ES5.
WeissYohji
Why the abandoned forts? Same reason as there's no standing military. It's something for the players to explore. Once, again, we're dealing with one of the most contrived premises in video gaming, here. With the way Oblivion is structured, the Empire has to be lame in order for the PC to eventually become the champion and leader of just about everything.
One bookstore in IC? Well, to be fair, there's really not much room in IC for anything other than what Bethesda put there. Why? Because the little Midwestern town where I grew up is bigger than IC. Indeed, you could drop all of Cyrodiil into the state where I live now and just about lose it. It's hardly larger than some parks I know of (I'm talking about Cyrodiil, here -- not just IC). IC should be a huge, sprawling metropolis, at least as Medieval cities go, and you need only look at maps showing cities like Athens, Naples, or Barcelona in that time period to see just how tiny this center of an entire "empire" is.
antonkr
Glass is hardly more durable than "metal". It's extremely fragile, in fact, as Megatarius suggested, although, it does bend -- just not very much as a rule. This is why the bottoms of large telescope mirrors have to be supported and why "flowing" is a problem with the very largest of them.
To address the issue of glass weapons/armor in general (indeed the whole progression of "levels" in weapons and armor), I think Bethesda just did it wrong -- plain and simple, and it's one of the most contrived parts of the game. I have no problem with Ayelid, Akaviri, Orcish, Dwemer, Daedric, etc., weapons and armor being made of different metal alloys, but even using words like glass or ebony (which is a type of wood) with reference to armament is just ludicrous. It would have been sufficient just to have different classes of armor, just like in real life, ranging from cloth/fur to full plate, but, no, the developers had to get "cute" and in doing so I think they ruined a degree of immersion for those of us who are more into the realistic facets of gaming than we are the totally fantastical. Using words to describe the composition of weapons and armor that are taken from real life and have very specific meanings already assigned to them seems to be just one more example of how "dumb" the developers apparently figured their target audience was going to be.
The_Vyper
Even with wiki-backed lore telling us that you can have a metal bow studded with volcanic glass that is somehow better than a metal bow that isn't studded with volcanic glass, I still think they blew it. That example I just mentioned show just how logically bankrupt the whole concept is. You can make arrowheads out of volcanic glass, yes. Heck, I've done that, myself, in a course in wilderness survival, and they're "sharp as all git out", as my instructor so elequently put it. Unfortunately, they will shatter upon impacting any hard object. I still have a problem with metal bows of any sort, whether you weaken the structure by imbedding shards of glass in them or not. I know archery. I'm a darned good shot with a bow, and I'm not even talking about a compound bow, which can easily be made of metal components. The technical level of Oblivion, though, is far behind the capability of making a compound bow, or even the spring steel that could conceivably be used to make a metal "self bow". We don't even have crossbows and arbalests in the game, the technology is so primitive. In fact, I rather suspect the wheel has yet to be invented, since there are no carts or wagons.
A lot of it is the fault of the leveling system. If Bethesda had opted for a truly skill-based system, devoid of the Gygax Curse, they could have gone with a simple progression of armor and weapons similar to what transpired in the real world. There's nothing wrong with steel. It comes in many grades and there are many weapon and armor technologies which have evolved around steel that has resulted in various grades of "quality", even just using that metal.
Skeletons and zombies: Yep ... only human skeletons and zombies. Someone actually created Argonian and Khajiit skeletons. I'd like to see someone create a mod that uses them in the game as opponents. I suppose you could rationalize it by saying that, for whatever reason, only humans can be subjected to necromantic magic to turn them into skeletons or zombies, but I think the real reason is that Bethesda just didn't want to bother with creating two more complete sets of meshes and textures, thinking that nobody would notice the omission.
I'd love it if the game gave us a variety of undead other than the human-based ones. You think a human zombie is bad. Wait 'till you meet a troll zombie ... or a bear zombie. And wouldn't it be fun to wade through a cave filled with rat skeletons?
Oh, I loved the advertisement! Now, if someone would just send my poor, underequipped thief one of those fliers. Oh, wait. She can't afford a permanent address so she doesn't get mail. Maybe she can kill a bandit who hasn't taken advantage of it, yet, and use his, instead.