How are you picking the matchups?
Gave every episode a number according to its production order, generated x random numbers, and put each episode up against the one it fell next to.
We did the same thing with TOS once in here. It generated lots of great discussions about episodes people sometimes overlook, and there were plenty of surprising results along the way.
Hopefully these threads get people to watch their old TAS DVD's again, or check it out for the first time.