I don't know how fair the criticisms in this thread of mod action are, to be honest. Certainly, when I first joined the forum all those years ago off-topic threads were locked pretty much straight away, but I don't think the mods or admins are particularly lock-happy these days. Certainly I know I try to use locking as a last-resort, and have on more than one occasion encouraged people to just ignore a thread if they want it to die.
A quick glance at the two most recent pages of "I Like HURRRR" shows 7 locked threads (not counting ones that appear locked because the thread was moved to a more appropriate sub-forum). That's 7 threads locked out of 100 threads total. That's not excessive, is it? And I think if you look you'll find that none of them was locked frivolously.
With regards to threads going "off-topic", I'm not inclined to let people pour shit all over a thread if they don't like it (which is the most common means by which threads go off-topic in this forum) because it usually amounts to a group of old hands bullying a new kid who made a bad thread 'cause he or she didn't know any better, and to be perfectly honest that's not the kind of forum I want this to be. It wasn't mean and cliquey when I joined, and damned if I'm going to stand by and let it become that now. For a recent example, take a look at
this thread. It was dead for ages, then someone fairly new to the forum revived it, and people got pissy at him. I was faced with three choices: ignore it, lock it, or nudge people back on-topic. The first wasn't an option for the reason I've just outlined above, the second was a dead-end, so I opted for the third, and now the thread's back up and running and on-topic. The off-topic in this instance, and, I think, in most instances, wasn't amusing banter or interesting debate. It was people hurling insults at each other and jumping on the "make fun of the new kid" bandwagon.