Long as your dropouts front and rear are properly aligned and parallel - QR axles are perfectly fine and can take alot short of flying off a 5 foot wall.

If dropouts are out of alignment - the axles will bend upon closing the quick release - a simple landing off a curb can be enough to snap the axle.

So check your dropout alignments - other than that - enjoy your QR setup.

And remember - QRs are not a permanent install - check 'em before and after each considerable ride. Especially if you have a disc-brake front.

=8-)