My husband and I decided to try My Big Fat Greek Restaurant last night...everything we had was good and our experience was fine, but nothing about it (the food, atmosphere, decor, menu) was spectacular. Even if you don't like Greek food, the menu is large enough where everybody can find something they like.
We started with the flaming saganaki, which was delicious, but can you really mess up flaming cheese? We also had the tyropita...it was just OK. We've had better at a dive Greek bakery just across from the Ohio State campus. I tried the Athenian spaghetti for my entree...it was good, came with garlic bread (not that spectacular), and the portion size was just right. Again, it was good, but not amazing. My husband had the "El Greco" calzone, which he said was OK. It wasn't very crowded when we went in (about 8 pm on a Saturday night) and our waitress was nice and attentive without being annoying.
It's not a bad option if you are on Mill, but not sure I would make a special trip just to eat there.