I have currently only 1500 hours in the game, may not seem much but its the only game i play now. Note that this game is real casual for a MMO, but thats why i liked it. I agree that it had a horrid launch 5 years ago ( I was there) and i almost refunded it. Good thing i didn't, if you loved the elder scrolls universe, give it a shot. I would'nt say its the best MMO because there is no such thing.
P.S Eso plus is real turn off at first,you DO NOT need to buy it for the first 100 hours.but afterwards when you got a character to max level, I suggest you should as by then you'll know why.
Cheers