Everything is fine
it runs at max in mine..i dont have beta, played once through friends account. dota2 is sex
1. creeps are fine
2. mouse scroll is bit slow in the begining, you can increase its speed in settings
3. i use zxcv,sd and f- attack move. i have never used legacy keys in dota1..
4.voice chat works, try screaming
5. yea the text is a little small but if it is too big, it willl occupy too much screen space..so it is fine