MITB 2011 isn't even the best PPV of the last few years IMO. I'm not entirely certain what is, but one that I definitely like better than MITB is TLC 2011. It didn't have anything as hot of a program as MITB 2011 did, but pound for pound, it was the more memorable and enjoyable card - There was no Cena on the show (breath of fresh air), Punk was actually headlining as champion in an awesome triple threat TLC match, I enjoyed the HHH/Nash feud unlike most, Orton and Barrett had an awesome Tables match back when the company remembered to book Barrett in things that felt significant, Ziggler and Ryder were in a hot program (and opening match to get the show going in a strong way) over the US Title, Bryan was cashing in to win the WHC on a vulnerable Big Show, Booker T. was putting over Cody Rhodes as IC Champion, there was a pretty good tag team title match, etc. Here's a video of the highlights, just look at the awesome moments in the main event:
Summerslam 2013 has every chance of equaling or surpassing MITB 2011 to me. The double main event can definitely hold a candle match-wise to Cena/Punk, despite the somewhat inferior build. And in the long run, the week-to-week build won't mean as much. When you re-watch the show years from now, the video packages shown before the matches will simply show you the best moments and the slick WWE production team can make even the most mediocre build look awesome, and the best build look even better. You'll see images and clips of John Cena choosing Bryan as his opponent which will then go back in time and show Bryan defeating The Shield/Sheamus/Orton and we'll see various clips of him talking about how he isn't the "weak link" of Team Hell No and we may even see his other accomplishments in WWE thus far. Then we'll see clips of Vince McMahon saying this and that to Bryan and Bryan confronting Cena about whether Cena respects him, yadda, yadda, yadda. Hopefully, WWE can get the rights to show clips of Bryan in ROH as well, as a way of showing how far he's come since he started out since this is all supposed to be building up to him winning the big one. (Come to think of it, how is the build so inferior to Punk/Cena?)
Same goes for Punk and Lesnar and the (real life) history that Heyman has with both guys.
All Summerslam needs is a strong under card to go with the double main event.