The MMA thread is also pretty long.
To be clear, I've posted more than once in the MMA thread and don't see a problem with it. These threads are made in such way that every time a new event takes place people post their opinions and compare the participants. An alternative would be a new thread for each match like they do with boxing. I actually think it's odd that there's one big MMA thread, but boxing usually is divided between individual fights and people don't see a problem with it because these threads are shorter.