I'd rather see Overstrain less often. Personally, I'd rather see it happen only when it's really really REALLY necessary... and in such a case, you'd get most of those Sit.Mods Thanos listed.
I remember a different thread (can't find it at the moment) that proposed allowing a version of Overstrain to be used, with a time restriction (you may only use it once every campaign/issue/month/[insert time period], etc). I don't mind that because it's cool to watch your players rise up and meet a challenge more easily than you intended - major style points! In general, though, I side with Malice on this one.