Question: Who are your faculty?
What to look for: Industry experience, doing work that is related to the classes they are teaching. Preferably at least one teacher who did the job that you want to get yourself some day.
What to do: Again, verify. Look up credits on Mobygames for games that were published. If a professor can't explain to you exactly what work they did on each title they worked on, find out yourself if you can, and view with extreme suspicion if you can't. Ditto if the school (or a particular professor) says they worked on "lots of games" but can't tell you which ones.
What to watch out for: There are a lot of "teachers" out there who are supposed to teach you how to make games even though they've never made one themselves. Would you want to learn how to cook from someone who's never been in a kitchen (no matter how many cookbooks they've read)? Would you pay money to take music lessons from someone who's never picked up an instrument? Would you take a skydiving course from someone who has never been in a plane? Someone with no experience can teach you the theory from a textbook, but they won't be able to guide you any further... and with so many bad textbooks out there, how would they know that what they're teaching is even valid?