Having tried out most of the mods on my PC, the only ones I really play are Desert Combat & Forgotten Hope.
Forgotten Hope is great, ww2 based with an emphasis on more "realism". Most soldiers have rifles, not automatic weapons, rifle damage is higher. Tanks actually fire some distance, not 100 feet, and airplanes carry a few bombs, but are very lethal.
While I appreciate the amount of time the other mod makers have put in, nothing else seems polished enough to actually spend my time playing.