What do use Mutas for

20 mutas in 2 minutes?

willpower101 20+ mutas in 2 minutes is impossible in a real game. Unless its a ums game with max minerals/vespene and even then unless you have fast build on its still probably impossible.....

If you build 20+ within a 2 minute window and they have 60+ marines or 30 and they are upgraded you will still lose. Against toss voids are mean we all know this, focus fire them, have more mutas, or support with other units.

Bottom line Mutas dont suck, you just have to use them correctly. Unlike in sc1 simply making massive numbers of mutas and attack moving doesn't work.... most of the time.