Frontline just has way too many freaking people on it, it would be far better, if each Team had only half as many People (12) on it.
Also, give Frontlines random hazard and items that grant Healing and Buffs to spice things up a little.

I am sick and tired of this zerg Metagame in Frontline which almost everyone doesnt pay any attention to because not only how braindead it is, but also that most People just rush for a fast end of the mode just to get their daily dose of quick EXP even if it means making your own team lose.