They should illustrate that Thor is the most powerful warrior in Asgard the way they did in the comics: Have big battles between the gods and giants and have all the "normal" gods be struggling, then have Thor show up and rout the enemy forces practically single-handed. It'd be a good way of playing up Thor's pre-banishment arrogance if he acts like he knows the battles would've been lost without him and is a big jerk about it, too.
Agreed with everything here.
I can see a couple Asgardians battling with a frost giant, being bashed around a bit. Then Thor bounds past them and backhands the giant into a nearby mountainside with a massive smirk on his face, saying "and where would Asgard be if I could NOT be everywhere on the battlefield???"
Odin overhearing that should get him pretty steamed up
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