I am in the hospital. I am trying to use the right click lock on rocket for the launcher rather than free aim but it does not seem to lock on very well at all. what am I doing wrong?

are you having problems fighting the mutant boss by the launcher? I found him pretty easy but some people had trouble. don't try to aim at the blue light. the trick is to hit his stomach in general, which a matter of aiming and timing (mostly timing). the rocket does not "lock on" to a target and then hit it 100% of the time. I found the right trigger not very helpful, I free aimed and did it. I think I did get beaten down and defib once, and it took a few minutes of running around that little room, but it is doable.

thanks! yeah I finally got it (before your post)...I was aiming at the blue light and missing every dang time. I read on gamefaqs to just aim for stomach. it took me awhile, i was suprised how hard it was to hit such a huge target and do damage. all over the net people seemed seemed to either think it was cake or crazy hard. oh well.

any bosses similar to that one later?

Nope, he's the only real big monster/boss.