What, the Fighter's Surge and Knack abilities? What's so bad about them?
I mean, Knack is about a spurt of good luck, which won't even necessarily succeed. It's so intangible, it's hard to get worked up about it.
As for the Fighter's Surge... I'm used to Surge mechanics from Mutants & Masterminds, they don't break anything or cause problems as long they're somewhat limited. (In M&M, by your stock of Hero Points, and the fact that you can spend Hero Points on so many other tempting things.) Twice a day is just not that big a deal.
I mean, yes, I can see people getting a bit worked up about the concept of certain kinds of mundane dailies, but these are more... dramatic? than mundane. They're more like a player resource than a character resource, if that makes any sense.
EDIT: IOW, it's not like the fighter 'knows' that he can Surge twice a day in the same sense that the wizard knows he can cast Sleep X times a day. It's that every so often he beats the odds and becomes awesome; the player knows how often it can be done, but in the fiction the fighter just gets desperate and does his thing, really well.