I have been playing the game for the last month f2p and im having the standard d2/d3 experience. Except for the AH and trading and buffing out alts or having mules, its pretty much the same thing.
I've been playing DH which turns out to be the best class afaik.
Anyway, I think the game is pretty good and im paragon 89 right now. Probably after I run out of exploration and hit the loot wall I will get over it. Other than that its fun. I'd say the most frustrating parts of the game are simply forming parties to do shit and the fact that the GUI gets in the way constantly. Clicking around during combat I click the minimap, random tab screens, and most ANNOYINGLY the monster level warning when you are in tough areas. Its prominently on the bottom of the screen and if you misclick it when a monster is doing 90% damage boost on you, you fucking die. Pretty retarded.
PS- I dont know if he mentioned this but another video I watched talks about there being like a 4 regular gem cap per day for groups. Thats pretty lame.