I've seen many complains about only being able to vote on the same maps, day after day. And I kinda feel the same way. I think the zm servers needs more maps, at least new maps. Here is two maps I like and have tested. Also check out gamebanana for more maps.
zm_russ-team_village_v2
zm_nomercy_airport_evo_v2
zm_russ-team_village_v2
zm_nomercy_airport_evo_v2