Federer's only win over Nole was in 2007. Nole has bitchslapped him in their two other meetings.
In case you'd forgotten, Federer had mono during the Australian Open 2008 (and recurring for a large part of that year actually). Fair enough, in the 2011 match Nole was just far superior, but in 2012 he didn't look anywhere near as invincible (lost a set to Hewitt, was taken to five by Murray and Nadal).
The match-up/mental issue/choke (or whatever you want to call it) happened against Nadal in the Semi-final as it nearly always does, but before that Federer looked the strongest of the Top 3. He hadn't lost a set (in fact, I don't think he'd been broken?) and was running high on confidence from the end of the previous year.
Obviously, Djokovic won more matches than anybody else and deserved the title, but if he had
drawn Federer I don't think the match would have been anything close to a "bitchslap", rather; I think Federer would have won in 4.
No point in speculating really, but if you're going to bring up their rivalry at the AO at least put it into context...