Gravity does not suck...
Although, understanding quantum gravity might answer whether or not it pushes or pulls... and also.. it might also open the doors to a lot of sci-fi like ideas.. wormholes/interstellar travel.. These things are possible within quantum mechanics, the problems you face are ones of relative time... Should you travel to, lets say, Proxima Centauri, 4 light years away, and then return. Depending on the speed at which you travelled, you may well arive back at earth, before you've even left.. You could then perhaps learn/understand in a more indepth sense, the ideas of entropic cascade, the twin paradox and quite a few pther things of the like...