I just got accepted to Tulsa also. I know of one guy here in Dallas that went there and he came out just fine. Everyone that I have talked to about the school says nice things about it, but I definitely know how you feel about USN placing it in Tier 4.
Based on speaking with actual practicing attorneys, they all pretty much say the same thing....get in to a school, prove yourself and graduate with high marks and you should be fine.
Id love to know if anyone else has heard good/bad things about Tulsa.
Congrats on your acceptance brother,