you can camp on CoD too

I agree. Even though it can be really annoying it's still a tactical move, if performed correctly.

a good strategy is throwing a grenade down as soon as the team spawns then switching teams

That's not a strategy, that's commonly referred to as a "dick move."

I'm all about that stuff 8)
And I only do it if my team is full of annoying 12 year olds who think they're hot stuff and scream down the Mic