Enjoy mode! I haven't played Oblivion in a long time but I don't think there's that much of a leap between playing it and Skyrim. There are features obviously which aren't in Skyrim (dual magic, shouts etc) which you might miss, but I think it's still essentially the same kind of game. Looking back on it, you can criticise it for the samey looking dungeons and ridiculous auto balancing (e.g. coming back to opening areas as a high level character will also raise the enemy's difficulty so you can't swarm through bandits as they're wearing glass armor) but all in all, if you liked Skyrim, you're like Oblivion.
Now, try to go back from Skyrim to playing Morrowind! That's a shock! Combat is essentially different and now wildly depended on dice rolls so your melee attacks can miss. The journal system is pretty basic, anything you do in a quest is written down as an entry, but there's no markers on the map telling you where to go. What really annoyed me about the journal was that I could start a quest, do a couple more note worthy, unrelated things, but there's no way to sort them out by quest so if you want to see what happened last you literally have to skip back pages to find the entry (it's not titled or anything) and what it was you were trying to do. So you could come back to it, as I have, and literally have no clue what quests you were on, which were completed and where to go next. And of course. The cliff racers. Ughhhh. Fucking cliff racers. The most annoying enemy in any Elder Scrolls game.
Still, I think Morrowind might be my favourite of the series. Playing it at the time, with it's sheer scope and scale was unlike anything else I'd ever played before. The setting is completely unique to high fantasy fiction and yeah, just many happy memories playing it (despite the bugs). Also, it has some of the best music: