various thoughts:
-Dark Brotherhood is the most fun of the major questlines as usual, though I haven't finished Civil War/Companions yet.
-Thieves Guild was great until it became more about nightingales and noctural than the guild itself
-the main quest was definitely better than Oblivion's overall, though the final fight was pretty weak. Same goes for the College of Winterhold questline, really.
-As far as DLC/expansions go, I'd be surprised if we didn't see some sort of major questline involving the Thalmor; the game does its best to make you hate them and they're the root cause of some of the major problems leading to the civil war, but there's no real chance for karmic justice.
-I'm also wondering if Bethesda would do an expansion involving another one of the major provinces; they haven't done anything quite that big before (though Shivering Isles came close) but they did say they were leaning towards bigger amounts of content rather than smaller.
-Destruction feels kind of unbalanced as a main source of damage (though I was using lightning, which is almost certainly the worst type of magic), it starts off strong, gets much weaker towards the middle of the game as enemies get stronger and Magicka costs become problematic, and then becomes extremely powerful lategame once Enchanting allows you to pretty much nullify costs. The Master-level Destruction spells were hugely disappointing though.
-Speaking of Destruction, Skyrim really suffers from a lack of spell-making; Oblivion would've been fine without it since you had like 5-15 spells per mastery level, but in Skyrim there's a measly 2-6! Hopefully there'll be a mod adding it in the future.
-Ice Form is was probably my favorite shout, though Throw Voice and Aura Whisper were both really useful for my secondary stealth character.
-Shouts were a good addition in general, though they do make doing a physical/mage hybrid build harder compared to Oblivion since you have to switch stuff around to use them.
-The dragon fights were kind of cool the first couple times, and then got annoying fast due to their frequency and the fact that my otherwise melee character was forced into using Archery just to deal with them. Still far better than the Oblivion gates, but at least those were optional.