That's not entirely fair. If you're going to allow Phoenix to not hold back then you have to have Thor and Superman not hold back either.
That would mean that Invisible Woman, Scarlet Witch, Storm and probably She Hulk are knocked out or dead in a few seconds - while the other one (Thor or Superman)along with Quasar engages the Phoenix.
Ironman - Hulk - Spider-Man - Wolverine beat WW and CM
It depends what level SW is at. At her higher levels she is a major scale reality warper and the male team would be outright overmatched.