Oh crap, that's right! Attila the Hun appeared in that Olympics lineup on TeenNick and I watched it. How could I forget? 
Edit: Since the poll for it has expired, I'll just say my score. That episode gets a 4 from me.
You probably forgot it because it was literally a forgettable episode. I watched it too and I don't remember a single thing. I do remember the Purple Parrot girl looking like she didn't want to be there. And for Taylor blowing kisses at Rachelle. But the episode is really forgettable, so you're not the only one.

And I have watched every single episode in full also. Most of them are decent in a way and have some sort of redeeming value. Even episodes like Jean Lafitte and Enormous Feather had one good round. I do enjoy going back and rewatching some of the more obscure episodes. Like I went back and watched Judge Roy Bean a few months back and forgot how interesting it was. But then there are episode I refuse to watch. *cough Spanish King, Snow Cone, Bifocal Monocle, Alhambra, and Amelia Earhart cough*
The only thing I absolutely know about every episode is their temple runs. I know a majority of the temple game rounds and legends too. But I definitely know the temple runs the most.
