Giant Pork Burrito Chain Challenge: Chipotle Mexican Grill

So a while back, I had the idea of trying roughly the same dish at a bunch of different places to see who's doing them the best.  Unfortunately I had the idea after going through my gyro phase.  I figured burritos the size of small dogs would be a worthy topic though...

Here are the rules: I will only be reviewing pork burritos because, well, it's me.  Also, it saves me from having to take places like Taco Time and Taco Bell into consideration.  I will not be purchasing any premium add-ons; if it isn't available as a standard choice, I ain't getting it.  I'll only be reviewing burritos from fast food chains, because bringing restaurants and taco trucks into it just casts too wide a net.  And because this is a series about a specific food item from fast food chain eateries, I won't be using my standard rating system for the atmosphere, service and so on (though I may mention those things in passing).  Also, keep in mind that I'm rating this stuff for what it is, not measured against authentic Mexican food or restaurants, so an A+ doesn't mean it's the best food ever.  Let's get started, shall we?