It seems that (Under Starlin.) he's been watered down, and that he stopped being a villain (A fate sadly beheld by MANY classic Marvel and DC villains!). In the first Thanos series (I liked the Keith Giffen issues quite a bit.) he wasn't really all that villainous. I personally prefer him in his prime as a villain (In Infinity Gauntlet, Thanos Quest, Starlin's Surfer run, etc.), albeit one who is still in love with Death (What's her current status, by the way?). I think that he's lost a lot of his luster and that he's been watered down a little bit too much. Again, this happens to many (Maybe most.) popular villains. But then back to the status quo. How do you view Thanos and prefer him to be written?
He is best seen to me as being a Cosmic version of Dr Doom, as one who is really evil at times, but who in their own minds are doing what needs to get done.
As in movie, Thanos saw the Universe needed to get bbalanced per his view, and he alone had power an dwill to make it happen!