The argument can be made that it will be difficult to make balanced groups, because it will be hard to find tanks and/or healers, and that this will also frustrate people into quitting. It will be a lot harder to find tanks and healers if they are made redundant by forgiving game mechanics in Tera.
They will have to water down the game(buy tera gold), so unbalanced groups and middle-skill people to succeed, because they will give up their submarine. Casuals needn't be able to win every fight, but they will need to be able to win a lot of them. You might not care, but BHS does. Most of them don't live with their parents anymore and have bills to pay.