I suppose when it comes down to it, and it seems like an absurdly simple thing to say, I just like adding new content to keep the game interesting. But beyond that, I definitely have my priorities and I have lines that I prefer not to cross. First off, as many have said, is simple enhancement. Back when I first started using mods for Morrowind, I have no doubt that one of the first I tracked down was to change character appearances. I loved Bethesda's game, but they had a knack for making some truly ugly character presets. New weapons, monsters, areas, and other content all drew me in, too, but I was a little more hesitant. I used all those, but only after my main had largely completed the game. These days I stick to largely the same trend. The first things I looked for were mods to help my issues with stuttering shadows (something I still suffer from, despite mods, patches, and drivers, btw). It must be a sign of my satisfaction with Skyrim overall that I haven't looked for many other widescale enhancements. HD textures, of course, and lighting improvements if only because of the aforementioned shadow issue. I never had much issue with the lighting beyond that, but when I saw how many mods had been developed I was intrigued enough to try them. Smithing improvements were also high on the list. Other than that, my mod's are mostly for immersion. Not just things like Needs (which I don't always use depending on the character), but new functions that fit the world and make it a little more full. The ability for followers to ride horses, for instance. An RTS mod, because of course the Dovahkiin could possibly found a new settlement. If I knew of a mod that added a sailable longboat, you bet I'd add it in a heartbeat. And yes, the nudity mods too. Because sex and nudity are realistic. Also, a lot about what mods I use is based around how I envision the character, and sometimes I've built a character around a mod. For instance, my current character is using a lot of wilderness survival mods. I had an idea of her having to survive in the environment for a time before getting into the bigger plotlines of the game, and this seemed appealing because I felt like I had neglected actual exploration on my main character. I'm also open to thief/assassin oriented mods for her, of course, because that's how I'm playing the character. Mods that add things like flyable dragons aren't in the cards right now. They might be later, but not based on how I picture this character at the moment. My main character, though, would welcome those mods because he's the original, vanilla Dovahkiin, and he is therefore awesome and deserves to fly a dragon or ride a mammoth ;). Someday I might even make a pirate-oriented character, if enough mods facilitate it, if only because there are mods that add sabers, rapiers, and flintlock pistols in the game. I know it's not lore, but that character would be for fun. So I suppose I'm really a mash-up. I lean towards lore and immersion, but I'll add stuff it looks good or it looks like it will add a neat feature. The only areas I don't really go into are the anime-ish mods, and that's because most of that content doesn't fit my image of the game.