Worth buying? I do like Bethesda (in general) but I'm kinda leery about shelling out a lot of cash for a game that, from what I've read, doesn't feel all that "long." Skyrim spoiled me; it would be a huge let-down to go from 200+ hours on a game to like 12.
Depends heavily on playstyle. Playing with a modicum of stealthiness, and taking a little time to explore the levels a bit really beefs up the experience (and that's the natural way that I play, anyway). 20+ hours is basically a foregone conclusion for me, and I've heard some say that they easily cleared 30. I'm also playing on very hard without any HUD, which extends things, and is also awesome.
Rush straight to your objectives, kill anyone in your path, and skip the details, and I hear it can be done in around 4 hours.
But there's a lot of replayability here, too. I'll definitely be doing a 2nd, and probably 3rd playthrough, and that seems to be the common sentiment.
So I'd say it's a pretty meaty experience. But there's nothing wrong with waiting for a price drop, if that's your thing. The game is very
good, but it's not life-changing.