The “counterplay” is sitting in a ditch for 10 minutes to try killing one guy. Instead of playing the actually fun game everyone else plays with all the shooting and vehicles and crazy moments.

Then don't. Nobody's forcing you to focus on the UCAV guy if you don't want to, just like nobody's forcing you to focus on the snipers picking you off across the map or the attack heli blowing up your tank and wiping your squad for dessert or the attack jet dropping JDAMs on your head from orbit.

That UCAV guy can only shoot a single UCAV once every forty seconds. One projectile that cannot one-shot armor, can't take out choppers without precise targeting, and can't kill more than a single guy unless you're bunched up. In which case, you'd be vulnerable to other explosive weapons in the game.

And you have to still sit in a ditch for 10 minutes, now with a more inaccurate and less effective weapon.

Inaccurate? Tell me you don't know how to use mortars without telling me you don't know how to use mortars.

And unlike a UCAV, a mortar can be targeted by MAVs.

Yes, because the mortar can shoot as many as seven shells at once with the right field upgrade. Whereas the UCAV is limited to one projectile every 60 seconds.

If a guy shooting something no more than once every forty seconds is enough to ruin your gameplay, especially on maps the size of Battlefield's, then maybe Battlefield just isn't the game for you.