I find EVE Online to be very nice for limited playtime. There’s no grinding whatsoever. Character advancement is in the form of skill training that takes place in realtime, even when you’re not logged in. Well, perhaps I should amend the no grinding whatsoever a bit, because obtaining ISK (cash) can be a bit of a grind if your preferred in-game activities require funding.
It does take forever and a day for characters to develop. This isn’t quite as critical as it might be, since even complete noobs can play with and even successfully compete against characters who’ve been around since the game was introduced. No, the noob won’t be successful in a 1v1 match with a veteran, but he can play an important role in a group setting after only a few days.
Where the game shines is in the complete freedom players have to drive the story in much of the universe. Beyond the space ruled by the NPC factions, in the vast reaches of “0.0” space, there are no rules beyond what the players make for themselves. Huge alliances of player corporations make war with one another. Empires are built, civil wars break out, former allies turn knives into the back of their erstwhile friends, anonymous parties pay organized mercenary groups to disrupt the logistics of their enemies. All punctuated by massive fleet battles between hundreds of ships.
It’s also got a really kick-ass player-driven market. In some ways it’s even more an economic sim than a space combat game. It’s near-complete laissez-faire capitalism, and if you passed Econ 101, you can exploit your understanding of how free markets work and make a fortune (if you’re so inclined…naturally becoming an economic magnate doesn’t involve blowing shit up nearly as much as becoming a front-line combat pilot, which depending on your tastes may be an important factor).