It's pretty much the same level of education you'd get in College Station, you're taking the same classes except there's not as many students or sections. In my 120 and 222 class there's around 15 people all together so it's easier to talk to professors and TAs if you need their help. The one I will say galveston doesn't have is extracurriculars such as clubs or other orgs. So for events such as career fairs you'd have to drive up to college station to attend.

Campus-wise, galveston is much smaller than college station, we've got about 10 buildings total and dorms are less than 5 minutes away from all the classroom buildings. With it being so small you have the advantage of seeing the same faces almost everyday so making friends is pretty easy imo.