I HATE THE F#CKING TERRAIN.
Skyrim is a mountainous region, and every mountain in the game is a complete bitch. You stray from the path to try taking a shortcut to your destination, because it looks like you can easily jump your way up the mountain slope, only to realise that it's not gonna happen, and you end up getting lost and losing sight of your follower as well. Or there are rocks that you can unrealistically hop, skip and jump your way around, and you end up reaching your destination by dropping down from some cliff and thinking "how the hell was I supposed to get here then?" I really wish they did what billions of other RPGs have done, and just create rocky terrain that you simply can not walk on, and just limit the passages you can use to reach certain places. Or, give us some sort of climbing game mechanic that we can use to scramble over rocks, instead of casually stepping down a cliff like it's some sort of stair case.
I HATE NPCs RANDOMLY SAYING SH!T TO ME EVERY TIME I GO NEAR THEM
Totally unnecessary, it doesn't add realism and it gets on my nerves. I use the enchantment table next to Viola's stall, and she stands there saying "Do you want something? Speak quickly." while I'm working on enchantments. Yes, love, I want you to shut the f#ck up. And sometimes the guards randomly mention places to you that show up on your map so you've got new areas in mind to explore - but I often miss the info because they're saying it in passing when I'm likely to be distracted by something else, and there's no way to get them to repeat it.
I don't mind the shopkeepers giving their sales pitches in the market place, or the guards commenting on my weapons and armour when I walk by - that's all fine, but people acting like you're bothering them when you're minding your own business is a pain in the ass. What's wrong with having it like in other RPGs where NPCs only talk to you when you activate them?