Totally agree with ardon, there should be some more bosses requiring strategy to kill instead of just regular tank and shoot ; then taking forever to kill a boss wouldn't be so boring, if you have to perform some actions, or avoid special, otherwise deadly abilities.

Although i suppose it's not that easy for devs to come up with that kind of idea with the restrictions of phone platforms (if there are, i don't know anything about programming), it would be cool.

On the other hand, there would be more ragequits from players new to the map and the ones (i'm sure there would be some) that wouldn't bother to learn a strategy, nor think by themselves.