Eh, my 1m is pretty crappy (only tested it once, natch, no PM), and I do okay in crits. Though that depends upon how you define "okay." If you want to win crits, a crazy-high 1m power is one way to do it, if you want to have fun, make attacks, finish with the group or even get the occasional top 10 or top 5, 1m isn't usually necessary in my experience.