No, in Wikipedia there are no GOOD reasons for deleting articles, they just delete it at their pleasure, at least that's what they make it look like.
One day I spent over an hour writing an article about a brand new girlsband, and guess what, they deleted it. Someone re-created it after a few days, I believe I helped writing it again, only to find the page deleted, AGAIN.
Today, that article stands (in a very BAD quality) for reasons I do not know. These change of plans are disrespectful. And what did they get with the mass deletion? I refuse to contribute to the article.
Another situation: the page of an actress served as a redirect for the show she participated in, I edited it and wrote the correction information, and I CLEARLY STATED where I got the information from.
Know what happened? They gave me a warning. It said "Do not insert informations that you know are wrong in articles, it can be considered Vandalism" (in a quick and VERY SOFT translation) - the information was again removed and the redirect was restored.
I was like "What the fuck?!". I replied to the guy who sent it and he replied back: "The article was deleted after voting and redirecting for the related page, otherwise it'd be FE 5" (I actually got it, FE redirected to the fast elimination).
Still, I asked myself: what the HELL is this? Does the guy even know I was the one who fixed the article?
And guess what? Ironically, the article is fixed today.
It's important to note it was in the Portuguese Wikipedia, they didn't create separate versions for Brazilian Portuguese and Portuguese of Portugal, and most administrators are Brazilian, and as far as I see the Brazilians like to mess with the Portuguese's work, because I REALLY felt tracked after those two situations up there.
So no, most administrators in Wikipedia are unprofessional and power-abusers. They know not how to deal with people properly.