Voting uber. I honestly believe it's too close of a call for Chomp's status to be determined by any real sort of solid evidence. If something like Darkrai was allowed in OU, we'd find ways to get around it without losing our whole team, sure, but that wouldn't really change its status. Since Garchomp was allowed without (much) question from the beginning of D/P, I feel that "finding ways to get around it" is what we've been doing; Garchomp is just that much better than any other OU. To be honest, I'm actually going to miss it to an extent should it get banned since I prefer a heavily offensive metagame, but as far as balance goes I'm set in my belief that banning it is the best decision.
I believe Garchomp is uber. It's an easy Pokemon to abuse since it's over powerful, which could be attributed to why it stayed in OU for so long. Its usage statistics over the months display its dominance. The suspect metagame has proven to be more balanced and exciting. Garchomp's absence hasn't affected the metagame in an extremely negative way. Counters for other sweepers have been emerging more because there is no longer a need to have an anti-Garchomp defensive core or revenge killer needed to prevent a mass sweep. The quality of play is enriched without Garchomp.
I think Garchomp in a way ruins the competitive spirit of the game. It's definitely not as Uber as RBYMewtwo, but it's still enough to make the metagame less fun.
Since what the vote really boils down to is whether or not you like the suspect metagame more (as that's really the best way to determine whether Garchomp makes the game less competitive), I vote Garchomp to Uber.