The real plus of the Quesarito is, of course, the quesadilla vessel. The texture that comes from a double layer of tortillas insulated with a thick sheet of cheese is a huge improvement on the basic burrito. Whereas normal burritos fall limp under the heft and heat of their fillings, the Quesarito has a fortified and delicious shell, and you won't spend your entire meal wondering if the next bite will make the burrito collapse in your hands.
There's actually more cheese in the chicken Quesarito than there is chicken and rice combined. On the obvious upside, that means spicy, creamy cheesiness fills every single bite. On the downside, though, the cilantro rice is the only other flavor -- the chicken didn't stand a chance against the cheese -- so the creaminess gets old fast.
The huge chunks of lightly seasoned steak hold up better than the shredded chicken, and, while it could be bad that the cheese on this one wasn't melted all the way, it actually worked in the Quesarito's favor by avoiding the ultra-creamy overload of the chicken variety.