I have gotten used to using stun grenades and I really like them.
They can be use to blow up barrels.
I like using them on the run to see if any opponents are in my path."free kill if I stun one =P"
Throw trow them in a room full of enemys then mowing them down with a P90 is always great fun.
Throw them towards a crowed area, followed up by a nade for free kills.
Sure I am also at receiving end of being pwned by stun grenades once in a while. If you dont overcamp one spot and stay away from your teams crowded areas, you should be fine. Just like staying away from air strikes.
My pet peave is LMG hallway and door campers!