>1. What are the best categories in the 2 handed skill to put points in?<
I typically sharpen every good weapon I have from time to time and move my skill points to whatever category the best weapon is in (best factoring in speed, initiative etc. not solely raw damage).
>2. Potions besides the red, blue and white, are the others worth keeping? Do you really need a constitution potion or stamina potion etc.?<
I found the others marginally useful but not worth worrying about.
>3. Does anyone have a break down of a good level to finnish each act at?<
All I recall is finishing the game at 30 and act 1 about 11.
>4. Are the battlefield dungeons extremely borring, or is it me?<
Randomly produced dungeons tend to lack character and the enemies are typically too low a level for you by the time you arrive <nods>.