In response to post #7450275. #7573088, #7574735, #7579910, #7608566, #7610357, #7610703, #7614495, #7615391, #7616457, #7649512, #7650272, #7654969, #7655519, #7659387, #7659550, #7661110, #7664614 are all replies on the same post.
The penalties are very soft. Just test it, you'll not find it gamebreaking! And if you plan to travel a lot by foot, get out of that suit of armor or use a horse! Knights didn't walk, too! And to be honest, I really think the Heavy Armor needs to feel heavy. I wasn't sure if the speed thing would work, but it seems to, and it just seems fair that someone wearing more than just a few kilgorams of steel on about all his limbs would move more clumsy than someone who's in comfortable leather amor! And last but not least, the speed bonuses from stamina will negate a large part of it anyways during your travels.

The health bonus you are refering to is not the main one. It's a smaller one that scales with the stage, and now lies between 100 and 25 additional points. As mentioned in the changelog, most powers will also become weaker if you do not drink blood regularily (at least once a day).
Regarding the severity of the Vampirism, the lore is contradictive: In Arena, Daggerfall and Morrowind, the vampires became weaker the less blood they drank. The "Getting weaker by drinking blood" thing was implemented in Oblivion, which did not stay true to this well-established part of the lore, and the thing was continued in Skyrim. Personally, I think it's even very contradictive in how it's implemented: If vampires get very weak when drinking blood, why would they feast upon it in the way they do in the Volkihar castle? And why would they drain your blood during combat and make comments about how powerful they'll get if they drink you dry? And why do Vampire Lords suddenly get stronger by drinking as much blood as possible? It just seems a bit akward, to be honest, which is why I finally put myself through to alter it in this way. Basically, drink blood once a day, and you're about as powerful as you're now in Stage 4. Drain Life even got a little boost, as it's now meant to be your primary source of healing yourself - if you want to cure your wounds, mend them with the life of your foes! Besides, with the abilities the Vampire Lord Form has to offer, you really get quite an array of tending to your wounds.
Or the new conjuration based "heal Undead" spells, which also affect you if you're a vampire. You can also use the Blood Potions the Clan Volkihar has to offer, those Healing potions that restore health completely, Alteration based Drain Life effects, weapons enchanted with drain life effects
In Daggerfall and Morrowind, Vampires did not have a natural health regeneration rate. Which I didn't know until a few days ago, unfortunately

Sources:
http://www.uesp.net/wiki/Daggerfall:Vampirism
http://www.uesp.net/wiki/Morrowind:Vampires
http://www.uesp.net/wiki/Lore:Vampire
Edited by Xarrian, 25 March 2013 - 11:39 AM.