I'm in UTMB SOM. Of course you won't find enough info, because you have to do your own research in what exactly you want based on what you have. It's hard to define specifics, but always worth the investment. To make it easier, I'll tell you what I think is relevant.
Reputation/Network: UTMB has some really old ties, since we're the oldest state medical school and part of TMC. It's a little known fact that MD Anderson (#1 in Oncology (including RadOnc) worldwide,
UTMB, MD Anderson to collaborate on League City campus | MD Anderson Cancer Center) is going to partner with UTMB in League City Campus for a Cancer Clinic, to be finished in 2018. It's not the top Texas medical school (UTSW and Baylor) in terms of pure research prestige, but it is absolutely reputable enough (about top 40 NIH funding) to secure top partnerships. Also, it has a better international than national reputation.
Perception: The doctors are well-known for chillness and patient satisfaction relative to all other Texas schools. When you're in Galveston, and Houston, you'll get a lot of instant "social proof" without the awkwardness of "ivory tower" prestige if you know what I mean. Also, starting off with any conversation with the beach and cruises gives others a comfortable feeling. But that's more of a personal preference.
Weather: it's absolutely humid, but definitely not unbearable, and I'm from dry Austin. There's a very nice seabreeze that makes it feel better than Houston humidity. As far as mosquitoes, I've never had any problems on campus (nor have I heard that there were), but if you live in certain areas of the island especially near the port, I've heard it's prudent to get repellent. I live a little further away and didn't have any problems.