I rarely play on Carbon so I can't really give you any decent advice about the site, however I do know that it is the favourite site of others I've spoken to about it. (namely microstakes SNG players who were not making any profit playing SNGs on Fulltilt & Pokerstars
but are making a decent profit playing them on Carbon).
I've played some micro buyin STT/SNG (the bounty ones), found them fun to play recreationally, and YES the players 'generally' are pretty weak. It was fun & felt like it would be quite profitable for a micro SNG player who has some experience with the game.
I agree with LeanAndMean above with their comment about the structure in MTTs being way too fast. However, they're not all like this - - I've played some MTTs on Carbon that had structure similiar to Fulltilt/Pokerstars (not sure why 'most' of the priv. tourneys use the fast structure MTT??).
OP, I wouldn't make a judgement call on just a small handful of members comments. I think you'll hear from some others who will tell you that Carbon is actually their favourite site to play on. I also don't believe that the merge network will be going away anytime soon.
I've actually been considering playing a bit more on there. Their micro buyin 'guar.' MTTs are about the only ones around that have a decent amount of overlay in them.