Like I said, I actually have a nice, inflammatory, opinion article that I'm working on for the site, so I'll keep some of the comments to it. My issue isn't even around the ideas, per se, it's just the nature of what it's done to people that may have been serious builders before that didn't engage much. Instead of working to engage more, get more feedback, show it off more, it's all about just trying to get it up to a certain vote threshold.
The best parallel I've come up with is a sports analogy: it's like playing golf. For me, and millions of other people, golf is simply an excuse to drink outside while smacking a little ball with a metal stick. It's an opportunity to make fun of my friends (and to be made fun of) when every bad shot comes along. At no point in time do we think that we're ever going to be pros (or semi-pros, or ranked amateurs, or even good amateurs). Do we do some practicing and try to get better? Sure. That way we can be on the give side of the making fun more than the take.
The MOC community was like that before Cuusoo came along. Some people were better builders, some people were probably good enough to "go pro." Some of them most certainly did go pro. Everyone dreams about going to the big time, just like every kid dreams about hitting that game-winning home-run, getting the touchdown, scoring the goal, or when you're older, making that hard chip out of a bunker for eagle (while drunk). We all got better because that was the only thing for us to do other than building.
Now though, the dream has changed, and instead of being about building, it's about getting selected... to "go pro" as it were. People aren't concerned about getting better... that's why MOCs don't get posted as much to ask for feedback, only to troll for votes. It gets... frustrating. Cuusoo gave us a few good builds, ones we probably would have never gotten without them, but the rest of the effect of that might not be worth it.
There is something else that always annoys me with submissions, though, and that's that so many of the builders don't seem to get that Lego has a very specific range that they're looking at for products, sizes, and build types... and a whole lot of builders just ignore that entirely. There are a lot of amazing builds that should have never been submitted, because Lego is never going to okay a 4000-piece classic space model, no matter how good it looks.
If the above post didn't offend you, you're probably reading it wrong.