I actually had no problem with Ronan in this, it didn't need to be a large role, and he's effectively-enough established as the Kree hardass authority figure.
The fact there are a bunch of other Accusers (at least in the way they're portrayed) was a little lame though. Just keep him as the sort of Kree tip-of-the-spear lone Captain America-equivalent, rather than what sort of equated to just...a General in WWII British Bomber Command, one of many, fighting from the business end of a spaceship.