Honestly, the game fails to impress beyond roaming around. I just turned cheats on and go around killing crap. Like all of these games, I stay interested for 10 hours then realize "wow, this is boring" and quit. The lack of classes is exceptionally frustrating. What skill do I want? I guess that. Does this get me anything? No....welp, that tree is worthless.
Except I'm at 20 hours - only because of mods.
That's why PC players have mods to fix everything. There a mod for immersive Khajiit language, a mod to fix skill trees to be more useful, a mod for menus on PC, a mod to make combat more engaging, a mod to add a million and one spells, a mod to make every dragon combat a little unique and much more challenging, a mod to change the storyline to give more options, and so on ad nauseum. Skyrim on the PC can be almost anything you want at all.
Plus, the class thing? You have limited skill points due to a level cap, so it's up to you to pick a build. Want a sneaky thief? You can do that. Want a summoning mage made of squish? Also possible. Want an assassin? That's also possible. But it's up to you to plan it out and decide what skills are worthwhile rather than just randomly hitting "LOLZ THIS SKILL LOOKS TEH COOLZ" and then realizing "oh wait, it doesn't contribute to what I want at all."
You also have to make the narrative your own. Like older games with worse graphics, it's kind of up to you to make up some of the background. You're sent to go kill a guy--why, and who? What challenges do you face getting there? Is your target paranoid and sending hunters after you? Even fetch quests can be interesting in Skyrim if you let your creativity run free.
If you actually, you know, use your imagination, Skyrim is a great game. If you're just expecting to be spoon-fed narrative and direction, you're looking in the wrong place. It's like expecting Minecraft to give you a goal--Skyrim is a sandbox, not a true RPG. If that's not your thing, that's fine. But you shouldn't go in expecting it to give you everything.