i don't know about most people, but, when it comes to the rocket launcher, i don't find it fun to use.
Sure the first few times you lock on and you see their ass running away only to get wasted by the missile is bloody funny. And likewise, watching a shrike try and shake one off without flares is good too. But, once that novelty has worn off, i simply don't find it fun to use.
I don't care if it makes things easy, or means it stops the shrike from taking my flag. I like to have fun when I play. And i don't get that if i am using the rocket launcher. I would rather chase the flag all game, skiing my ass off, and loose, then stand their on D with the RL.