Terroni deserves its high ratings and ubiquity in this city (I also hear they opened up an LA location). It's not exactly revolutionary or exotic food, but that's not what you come to Terronis for; you come for casual and rustic Italian dishes and the bright and lively atmosphere.
I have been going to the Queen location for years and have been to the Adelaide location a handful of times because I work nearby. Both locations are bright, busy and serve tasty (though not amazing) food. I find the service to be good most of the time despite how busy it is. The Adelaide location feels "fancier" because it used to be a courthouse. The ceilings are high and the general vibe is a bit trendier and more upscale than the more chalkboard, jars and knickknack feeling of the Queen location.
Call me a narcissistic but I used to frequently get the Natalina pizza. The Queen location has a nice big patio which is always a bonus. One last random tidbit is that they do not serve diet soda, balsamic vinegar or caesar cocktails.