When you address specific issues based on your experience from a particular Wikipedia, please be candid about the details. Because, it will help to see the issue clearly and won't annoy Wikipedians from other languages.
Some practices in Tamil Wikipedia regarding deletion:
* There is no automatic deletion by bots or filters.
* Only clear cases of vandalism / spam / machine generated content gets deleted ASAP as a cleanup measure.
* In cases of non-wiki / disputable stuff, we leave a template saying "This article is not suitable for Wikipedia and it may get deleted. Please improve the article or discuss in Talk page". Usually, we provide a month's time before deletion. All these articles are put in one category.
* On cases of many such articles by the same user, we leave messages in his / her talk page and try to reach him / her by all means. (Email user, phone wherever info is available)
* In case of dispute or mass deletion, we nominate the article for deletion and proceed based on voting / feedback.
* We also try to improve the stubs, re-organize under single page. Therefore, the information is not lost.
* We encourage users to write articles with at least 3 sentences.
* There is no single / group of users doing deletion but any elected sysop can do this when the action is necessary. Tamil Wikipedia has 19 admins with diverse background till date.
I wouldn't say you should never delete an article. Quality is important and there should be some minimum standard enforced by community discussion. At the same time, I have heard from people who got discouraged after their article got deleted and they couldn't understand why. Not many follow recent changes regularly and have no clue why their article got deleted. So, it may be a good idea to auto generate a mail to the user explaining the reasons when his article gets deleted. She may opt out of such notices.