Lately I've made about 10-15 characters. I've only played each for about 10-25 hours each. I would say the biggest gripe I have about Skyrim is lack of classes. I mean you could argue that, you don't need the game telling you that you are an assassin, when the skills you are using assassins would normally use. That said though, I still like the game recognizing that you are a specific class. It makes you feel like the specific skills you use matter more. That's is just my personal opinion.
Another issue bugging me for a while is the lack of attributes. It really bugs me that don't know how strong or how agile my character is. Skyrim's character system is one dimensional which is really shallow imo, two dimensional character progression is way more deep and rewarding.
Those are some really big glaring flaws I have with Skyrim. There are more, but I'm just too lazy to list all of them. I think Skyrim is amazing game, but when it comes to actual RPG mechanics, its lacking heavily.

