Hm, I'm not sure... Plagueis is fast, and has force on them. I put Mundi at better than Tiin and Kolar, but there's no Windu present, to draw a comparison to the famous strike team. If Plagueis can get one or two down fast enough, he can likely win well... well, no, taking down two are required for that path, if he just drops one in an initial rush but then another engages, then he's going to be caught up.
Yea... dropping one fast then being engaged by the rest is a fairly likely opening result... then past that point... rough battle. He might win, or he might get cut down by the last Mundi while dropping the next to last one...