Now, I can understand that not everyone will share this opinion, but yes, in my mind, if you have done the research and made sure your story fits with everything else, then... yes, you are a better writer. You are taking your plot and molding it around the characters and their continuity. Bendis on the other hand come up with his plot then jams the characters in to fit it. That is bad writing.
The example lobsterj gave above is a perfect example of this. It could be the best written story in the world... but it's not going to work within the context of the MU. I read stories in the MU, because of the continuity and shared history of allthe characters and I love seeing that played with and built upon. If you just want to write any old story, why bother trying to say it takes place in the MU if you aren't going to do the work to make it fit.
I work in a call center (I know, exciting job right), but I have to follow certain rules to do my job correctly. I have tyo answer the calls that come in regarding our products. I can't just have my friends and family cal lme all day long. While I would still be answering the phone, so in the most technical sense, still doing my job... I am not doing what is needed to do the job properly. That is what a writer who doesn't do the proper research is doing. They are technically still writing a comic book story, but they aren't writing it while taking into account the continuity of the MU, so therefore they aren't doing their job correctly, and are putting out subpar material.