Thank you all for the suggestions. I will get to work now and start preparing the list of sportsbooks that are active on bitcointalk and do my due diligence in research with respect to the categories that I'm going to tabulate. Will definitely add KYC as a category. There are some good suggestions in there but quite a few of them could be taken in as an opinion instead of cold hard facts. Since opinions on certain things like "How's the UI, etc" differ from person to person, I will keep it out of the categories. Maybe in the future, I could add a column of my review on the sportsbook or a few remarks about them.
Edit: Note that I'm focusing only on Sportsbook aspects and won't be covering casinos that do not have sportsbooks along with them. I personally am interested in sportsbooks, so, will stick to that. Also, the list will be huge and harder to maintain if I add casinos as well.
Yes, in regard to UI as there are different perspectives among the gamblers and it's really a self explanatory fact that they have to choose or to put this thing into considerations, I believe that it's more n how trustable the site or the sport-house will be and how they handle the client in terms of real-time supports and the competitive odds that they have inside the house, plus the perks and wide scopes of available sports and places that they can cover.
One-stop place where you can sort all those games that you know and wanted to bet with, just an opinion, but the focus is on the reputations and with how the team handles their clients.