Reading through some forums about multiple supers games produces some similar results, even with radically different rules elements. One thing that I've noticed is that in any game that allows for any kind of flexibility or narrative variance in what "actually" happens, people will begin to discuss the where the line between "cheesy" and "abusing the rules" begins and where "setting tropes" leave off.
What can you parry with? What can you throw at someone? How much can you use the excuse that "it's magic?"
My personal preference tends to be to let things slide unless it's painfully obvious that the player in question isn't really just being over the top, but is just handwaving something in order to get some kind of perceived advantage.
Can it be silly to have a character use a reflective belt buckle to deflect a laser back at a bad guy and blind/injure him? Sure, it could sound really over the top. Some people may hate over the top action like that. But the real question is, is it something that has happened in comics before?
If it's something I can recall seeing in comics more than once, it's probably something that isn't going to ruffle my feathers too much when I'm running a game.
I do realize that everyone at the table has to have fun, and that sometimes too much of something can really shift the tone of a game and change the "feel" of the game. I mean, nobody wants to be Ryan Reynolds in a serious, grim, dark Blade event, right?
On the other hand, if someone does something really over the top, but still totally super heroic, once or twice a session, does that really ruing the game for everyone? Is it just a matter of people liking different aspect of comics than you do?
Like most things in gaming, it's a balance. If it happens all of the time or really, really throws someone off their game, and isn't something the "offending" player really has to do to enjoy themselves, sure, have some talks, make some adjustments. But I'd urge everyone at the table to remember that one person's cheese is another person's cool, and unless the game degenerates into a fully on session of over the top silly oneupmanship, forge ahead and save the world.