I've been on both sides of the spectrum of this--I've "vandalized" (I was young, it wasn't malicious but I can see now it was disruptive--and for those wondering...it had to do with wild cats slowly taking over my city... haha) and I've legitimately tried to post useful and factual information and I will say this, the thing I universally found to be my biggest obstacle was this elitist structure of the "higher ups"--the big editors held way to much power (I can't speak to the present as I no longer even try) but I can't tell you how frustrating it was to try and be helpful and good, and then being told I am an idiot/noob and to cease from attempting to write wiki articles. It always seemed like some of them were just on power trips, and didn't care for your "help".