Sami's is quick, reliable and right around the corner from my office. It's not the best Mediterranean food I've ever had in my life, but I know that I can be in and out in 10 minutes, even when there appears to be a wait at the register. The one time I had to wait about 20 minutes, the owner apologized to me personally and gave me a free piece of baklava (which was delicious).
I've deluded myself into thinking that the gyro salad is moderately healthy (hint: it's not), so that's what I usually go for. The meat is pretty good quality, and while the greens do feel a little prepackaged, I'm getting a salad from a gyro place... so I don't expect a whole lot more.
Service is usually pretty decent, and the folks there are kind. I'd recommend it for a quick lunch, especially given the limited selection within walking distance of my office. Surely beats the pseudo-food they're handing out in styrofoam boxes up in the cafeteria... Yikes.