Well, that was my first time with a team of randoms doing it so it was a new experience for me and my subsequent play with other randoms never had similar tactic but yeah, it's definitely a good idea especially when your enemies are Reapers.
Also, is there such thing as unlimited missile launcher or unlimited 2 extra lives?  For some reason lately I always got equipped with these two items and they never expire regardless how many time I used them.  Should I be more careful of when I use them?  Is there a limit to them?