Elite: Dangerous, on the PC.
My initial thoughts on it: OMG COMPLICATED. Just piloting the ship around without it going bonkers and without me smacking directly into stationary training targets was hard enough to learn... let alone everything else I've yet to do. Learning combat was very tough, but holy heck is it satisfying. Next is learning how to dock without either crashing, or being fined or attacked for doing it wrong.
Just.... holy heck, EVERYTHING is complicated and deep in a realistic way. The game doesnt do ANYTHING automatically for you, except things like targeting assistance that you would expect an actual ship to do. Just docking means dealing with landing gear, making sure weapons are offline, requesting docking permission, matching the station's rotation, going through the slot thing, locating and then hovering over the proper landing pad, and then actually landing on it without smashing into anything. There's a bazillion different keys and such that do a million different things, and the UI is.. hard to describe. Does a good job of giving the feeling of actually being in the cockpit.
So far, the game is freaking amazing. I'd heard alot about it, but hadnt gotten my hopes up too high... but this has the potential to be one of the most amazing space-related games I've ever seen.
That learning curve though.... it's not as bloody cruel as a MOBA or something like Dwarf Fortress, but it's still very vertical, and actually mastering any aspect of it is going to take a loooooooooong time.
EDIT: OH GOODY and now for my favorite part of any game that goes online whatsoever: CHOOSING A BLASTED NAME. UUUUGH. This is why I looooooove the way Steam and Battle.net do it, where it DOESNT FREAKING MATTER if someone else is already using the name. You can use the bloody name ANYWAY, and your full "account name" will just be different but you wont actually see or use it much at all except when dealing with friend invites and such. That's how those services do it. But this is doing it the traditional irritating way. Naturally I cant use "Misery", which is irritating. Bah. This'll take awhile, I just know it.