Until there is an easy mainstream way to fund a bitcoin wallet then I think bitcoin payment gateways are kind of pointless and will struggle to get any real adoption.
Probably because every new bitcoin processor seems to rediscover the same set of security holes and insecure practices.
That said, Coinbase has raised some cash, so perhaps they can avoid this fate.
Easy is going to a website, putting your credit card number in, accepting a transaction fee, and receiving bitcoin. Until aquiring bitcoin is easy, bitcoin will stagnate.