He is turning Palace around. Four games ago, posters on here were predicting a record low PL points haul. He has already got them back in the mix and with his record/experience, I wouldn't back against them surviving.
As for Sunderland, I can see them staying up. They've not had a game against lower table opposition since Poyet took over have they? Yet they've managed to pick up wins against Newcastle and, more significantly, Man City. You'd expect them to pick up points against Stoke, Palace, Fulham etc...
Fantastic is a little over the top. I would reserve that epithet for managers who have won multiple trophies at the highest level. Roy Keane and Paolo Di Canio are born winners and bad losers but it hasn't helped make them good managers.
Gus is now in unfamiliar waters. Managing a top flight...