Too bad I've never actually made an Add-On.
Based on that, you're pretty much saying that making bad Add-Ons is better than making no Add-Ons at all.
Think about it. Bad Add-Ons are usually non-useful, not creative or are just usually some crappy weapon model mixed with the overused spread-fire code as well as loud earraping sounds, or just something else that sucks horribly.
EDIT: Technically, Music counts as an Add-On, so yes I've "made" an Add-On.
EDIT2:
Here it is. The MediaFire link is broken/gone though, and I don't have the file anymore.