There is a ton of good advice on this thread. I'm at a T14 and struck out at OCI, at least in part because I did everything wrong in the book. I bid on regional offices that were taking maybe a couple of summers, bid on firms that were struggling financially and had small class sizes, wasn't prepared enough for interviews, and didn't know what I wanted to end up doing.
In contrast, I have friends at my school with significantly worse grades than me and did well at OCI and ended up employed, despite being around the bottom third of the class. They bid wisely, bidding on only New York firms with large summer classes, including bidding pretty much everywhere but WLRK, CSM, and SullCrom. Both of them ended up with V15 callbacks (although they didnt' get offers). Still, it's much easier for "personality" to matter when the firm you're interviewing with is hiring 60 summers, rather than 5. While they were getting a chance to sell themselves to people who would be their future colleagues, I was trying to convince NYC partners to hire me for an office they may not even have been aware their firm had.
Also, they had an idea of what they wanted to do. For example, one friend came into interviews telling every firm, I want to do bankruptcy, I worked for a bankruptcy judge this summer, I'm taking these bankruptcy/ restructuring oriented classes over the coming semesters, etc. He did way better than you would expect from his gpa, and I think this has a lot to do with it. It's one thing if you finished top 25% in your class and say I'm not sure I know what I want to do, but it's another if your grades aren't good. Iffy grades show that you may have been overwhelmed by your first year of law school, but showing up knowing what you're talking about and showing that you know what you're getting yourself into can go along way towards alleviating concerns that you'll be in over your head as a 1st year associate and quit 18 months into the job.
Basically, I'm completely boned because I came in unprepared and made a ton of mistakes (plus the whole not dominating 1L exams). Now, I'll have this sweet T14 degree that's not worth the paper it's printed on because I couldn't get an internship 1/3 through my law school career. Crazy how little time it takes to get your dreams crushed