OMP is absolutely awful. I'm letting my membership lapse this year. The flake ratio is three or four times higher than MM, the site doesn't require members upload any images to activate their membership, there's minimal screening of members and activities and is generally the domain of wannabes. OMP has a larger member base, and might be worth taking a look at if you're in a smaller market and don't see any local MMers, but otherwise I'd just skip it.
