I don’t think that defining different classes for questions will be so useful. The main problems with bad questions, besides outright laziness, is that the user (maybe a newbie, or someone having difficulty writing in english) cannot formulate the question in a way that complies with maybe complex guidelines.
Let’s face it, even if we tell people repeatedly to read the help first, wery few will do it thoroughly, even if they are not “lazyass”. Sometimes you just need an answer without too much reading about “rules”.
So a way to improve this (I’m really brainstorming here) is a sort of UI for “question incubation” (for a want of a better term). When you want to post a question you could have two choice: direct post, or “managed” post.
If you are sure your question more or less follows all the basic guidelines, you direct-post it (and you don’t complain if a lazyass BS question is insta-nuked to oblivion).
Otherwise you ask for “managed” posting: the post will be visible only to users (maybe with some minimal rep) that are willing to help the OP to build a question that is deemed acceptable. This special UI should help the OP and expert users collaborate, it shouldn’t be a sort of review queue with no back&forth interaction.
This facility could help the newbie (or inexpert) iron out a nice question before actually going public on the site.
I admit I have no specific idea about the actual functionalities of the UI or the process involved, but I thought it could be an interesting idea to put on the table.