The problem with one match for the entire show is if the entire match isn't good (see Season 1's All Night Long match between Mundo and Puma) or isn't chock full of dudes (Aztec Warfare), then the rough patches drag the show down.
Six to Survive had a lot of rough patches.
Ivelisse, Taya, Fenix, King Cuerno, Johnny Mundo, and the eventual and predicted winner, Pentagon Jr., faced off in an elimination match for the title shot at Ultima Lucha 2. First problem - in a completely logical development (good) Mil Muertes appeared to take out King Cuerno (good) in like the first five minutes of the match (bad).
All six wrestlers seemed to be having a tough time just moving around each other, with a shortage of that energy and crispness that makes the best Lucha Underground matches special. There was a lot of one-on-one wrestling without a lot of the obligatory "make sure there's a thin excuse for the other wrestlers not doing anything" stuff. The camera frequently caught Pentagon just standing on the apron.
A lengthy segment between Taya and Iveliesse, possibly setting up an Ultima Lucha match, didn't really move things along much, and wasn't up to what I know Ivelisse can do and what I've heard Taya can do. Taya did end up taking some hellacious moves from Pentagon before she was eliminated, though.
Once we got down to three, things picked up. But when it was down to Fenix and Pentagon, the pacing was odd, with them sort of cycling between high speed action and selling exhaustion. It wasn't bad, and the finish was strong, but with all the weird pacing of the rest of the match, nothing really clicked. Lots of great individual moments and spots that somehow added up to less than the sum of their parts.
On the upside, there's no way we're not seeing Cuerno-Muertes at Ultima Lucha now. And that should be pretty spectacular.