Errm, I haven't had a problem with fights dragging due to too many hit points at all. I've only really played levels 1 through 12, though - maybe it's worse at epic tier. Maybe it's worse if you never have a striker and/or have lower damage builds (like Cha paladins instead of great weapon fighters)
In the sessions I've played (mostly low level), usually one striker (I think two sessions with two). In the games I DM, there's 2 strikers in two groups and 1 striker in the other group. No rangers, though. Warlock in each group. Not a lot of low damage builds, though - wizards closest thing in two of the three groups, but couple fighters, dwarven melee clerics - warlords who do okay damage and can give someone who does more damage a leg up.