The bombs are basically the blues. The setup's story basically is that the 2 clears have rigged the ninja hideout with explosives. It is up to the ninjas to clean up the hideout and get revenge on whoever planted the bombs there. It's also up to the clears to put an end to the ninja's once and for all, which gives both sides that extra incentive for winning.
Honestly i think this being played ranked would be a good idea. It's basically 5 blues against 2 nillas. Where its a 66% chance for 2 blues to be clear.
this is not bad. you can't really say something is bad until you've actually played it imo. kebabs look vile, but they taste fantastic. Also setup 3 isn't as townsided as you think