As in games like the old UO and current DarkFall where you level skills etc? I like them as in theory you're always progressing. I think it's cheap of MMOs these days to trick people with grinding for gear rather than levels, it's really the same thing but people hate grinding levels but think nothing about grinding gear.
If there is stuff to do afterwards then I'm all for it don't get me wrong, I play literally every new MMO that comes out but don't feel any have got it right in a long time.
+1
Personally when grinding gear I don't feel like I'm improving my character, only the superficial garbage he/she wears. I'd much rather be grinding skills and seeing the character develop, then grind for purely cosmetic gear, but as in UO I didn't ever wear the "top gear" as there really wasn't any when I played, you wore what fitted your RP style and even people who decried roleplay found themselves trying to look cool, by oddly enough wearing the armour that suited their characters best, so you saw evil guys wearing skull masks, or dyeing their hair to look like nut jobs etc.
I loved the balancing aspect the UOs skill set, having to work out what skill you wanted to max, then if you wanted to change having to re-grind another skill up to suit it. It seems basic, but strangely no game since has implemented anything near as good.