3.How many Acts are there? I keep getting sidetracked with side quests so I may just progress with the main game and then come back to the side stuff later.
When you Finish the game can you just load up your save and carry on?
The story missions are very much designed to advance the plot and very little else. The missions are rarely challenging and they seem to be shorter than some of the side quests.
I'm in act 3 now and I suspect I'm 1 or 2 main missions away from finishing the game so I'm currently focusing on side stuff.
I believe you can go back after the credits roll to finish things off though.