Unfortunately, I joined the cracked bumper club yesterday with my 2011 WRX ....
tapped a snowbank at low speed on right front... tore a piece off the lower lip of the bumper and cracked it too... Amazing how flimsy and brittle the bumper seems. As many have stated, there is virtually no reinforcement for the cover. A bit disappointing to say the least.
If anyone has turned up affordable replacement options, I'd be interested in hearing of them. OEM, or aftermarket.
FWIW -- my feeling is that the bumper covers are in fact low-quality, and much too fragile. Yes, it's cold up here now, but this very minor impact should not have fractured the cover, IMO.