Having not played the game, I can't comment on how the touch controls for camera controls. It probably controls decently enough (I'd argue probably worse than dual analog, but not by much if done right).
The one thing that is annoying to me with touch based camera controls is that they are just that, touch based. You block the screen with your stylus or finger for a certain period of time to control the camera. Is it a big deal? Kinda sometimes, depending on the game. In a game like MH, it may block you from seeing attack animations or certain bits of info like that. For other games, like tower defense where you plan out your layout before waves start, it matters way less. Ever notice how most touch only games have different "phases" (like tower defense) or controls to the very very small corners of the screen to not block any action?
Is it a game breaker? Probably not, but controlling camera with the touch screen would most certainly be better with 2 sticks but the difference might be smaller than dual analog vs one nub + d pad (PSP style)







