The great thing about Bad Company 2 is that because of destructible environments, you don't have to worry about guys sitting in corners. You could:
1) Grenade launch the wall down.
2) Fuck the grenade launcher, and use an RPG
3) Ram a Humvee, or better, a tank right through the wall
4) Shoot a well placed shell from a tank
5) Place a C4 on the wall
6) Or just demolish the entire fucking building
So many ways to approach the situation ;P