I enjoy the combat in PoE significantly more than I did in D&D2 games. I'd agree on one point - I, personally, would drop the 'per rest' skills and make them all 'per encounter'. Expendable spells made more sense in D&D games but here, with classes like the Cipher, who can spam spells during every encounter, not so much. This could be balanced by decreasing the number of uses in each spell level. But that again, are my personal feelings.
The other thing, which is a bit annoying - some of the buffs, Priests' in particular, could use a D&D like 'X hours' duration. I am not sure if having to buff your whole party with Accuracy boon every encounter brings anything to the table - decreasing the potency and making it last 8 hours would, to me, make more sense.