I actually feel the opposite way, I want LESS fights in act 1. More quests, more convo, less fighting. There's too much as is... my humble opinion.
I believe that explorer mode was specifically made to address this type of concern. I hope that it can end up being the sort of experience you're looking for, if it is not right now.
I do not think that there is too much or too little combat. I like the balance right now. I would, however, like to challenge my friends in the Arena more than once, so I can get my fill of combat in whenever I like. That, and more PvE encounters there in general. I feel like this would add lots of replayable combat to the game, without bogging down the main point of the campaign. That, or they could expand and add to the AI in Arena mode. Or both. Seems logical to me.