GM Blog : Coming Soon: "The Battle of Crimsonwood Keep"

Boomers weren't a glitch. They were merely a good idea that was used to people's abuse; so Nexon had to patch that (the whole Poison abuse issue).

Bigfoot wasn't entirely a glitch either- the fact it was poisonable was one of Nexon's intended ideas- Prose even seemed to embrace the idea of it when prompted about the use of poisoning it; but when Bigfoot killing abuse became a problem, it got labeled as a glitch.

"glitch" doesn't refer only to programming errors.
It can also mean a design error.

When Nexon came up with the brilliant idea of Boomers, they just didn't think it through. They forgot that whatever killed the original boomer might still be around to kill its instant replacement, instantly.

And Bigfoot... The idea of a mob that is boss-like in HP and EXP but spawns in several maps and has weaknesses is certainly original. However, again, they didn't think it through. If they'd made him weak to fire, say, it might have worked. But whoever decided to make him poisonable must have forgotten (if he ever knew) how poison works. Surely they didn't mean for something with so much HP to be taken down in a minute.
Or, if they did, just what did they think would happen? An F/P would meet this new monster, try out her entire arsenal of skills against it, see that poison works and she got 3m exp. Did Nexon think she would then say to herself, "Well, that was fun, I think I'll go back to Wolf Spiders now"?
If Nexon thought that, that's even worse than forgetting the finer details of the poisoning skills. It's a complete incomprehension of how the game is played. Players will always try to train wherever they can get the most experience. Obviously that F/P would say, "Wow! I gotta find me another one of those!" and another, and another... Bigfoot "abuse" was bound to happen.

So, it's possible that the CWK PQ (and the rest of CWK II update) will be perfectly coded, yet glitched in design. Some nifty-keen idea that turns out not to work so well in the real maple world.

For instance: one of the unique class skills the PQ requires might be one that people get very late, if at all, because it's not very useful in regular training or bossing. So, it would be close to impossible to find a party.