I love DA2 combat. Just finished my eighth run half an hour ago! (Probably the last for now, but I imagine I'll go back some day.)
Things I found more fun and strategic about the DA2 combat include: faster pacing, more interesting animations, cross-class combos, enemy elemental immunities, no health potion spamming, assassins that stab you in the kidneys and steal your stuff, the entire Force Mage tree, warriors causing friendly fire damage, boss fights that require different strategies to normal combat and Merrill. Just ... Merrill. (I'm never sure if she's my favourite companion because of Eve Myles, or because her specialist tree is so amazing.) I could probably keep going for a while, but those were the first ten things that sprang to mind.
There are also a handful of things about it that I find worse in the sequel, like the frequently poor encounter design that included too much padding things out with endless waves, and the inability to scout ahead with stealth and use traps. However, the positives definately outweighed the negatives for me. Now that they've seemingly learned their lesson about the proper use of wave combat (it was done much better in the DLCs) and we have traps again, I have high hopes for DAI.
On the whole, though, I enjoyed scything through things with my two-handed warrior in DA2 a lot more than standing in the next room while the mages cast Storm of the Century, then shuffling into place so I could drink endless health potions. It's not like there was nothing wrong with the combat in Origins.