I actually don't have anything against Unity as an engine/toolset. I played around with some browser based space shooter a while back, and I was kinda impressed. Wanted to check it out to see if I could make something of it, but dropped it because I lost interest/no time.
I can't recall anything good being made on that engine though, but that is more to do with the kind of devs that use unity. I hope they arent afraid of modifying what is there, they can still get something good out.
At least we know it wont be on Windows phone 7