A few years ago two ghetto pizza places located right next to where my band used to practice got themselves into a very heated "Halifax's BIGGEST slice" war. It became ridiculous. The two places -conveniently located side-by-side - were Rassy's and The Pizza Factory. Neither pretended to offer anything remotely resembling quality pizza; all they promised was volume. In the end, The Pizza Factory won the war by offering a "slice" of pizza (for $3.49, no less) that was, in essence, an XL pizza with the crust cut off on two sides to make it look vaguely slice-like. I poop you not - you could get slices that were about 2' long. The crust couldn't support the weight of the pizza, so when you got a slice for take out they would basically fold the pizza over onto itself a few times until it was a little more managable and then wrap the whole mess up in aluminum foil. Heinous. The Pizza Factory went out of business, but Rassy's is still there, kicking out the huge slice jams.
For those of you who may've been to Atlantic Canada and are familiar with the concept of the "donair," you may be interested to kow that they offered a "donair slice" in addition to the standard issue pepperoni and vegetarian options. Again, heinous.
As I said, my band used to practice next door (and I actually lived around the corner at one point as well), so I will cop to having bought a slice or two in my day. Never a good idea.
As far as actual, quality pizza goes, Halifax is blessed with a lot of really great options. Salvatore's and Tomasino's both offer really fancy-pants, delicious, thin-crust gourmet styles. The sun-dried tomato, artichoke heart pizza from Salvatore's is probably my favorite pizza in the city. Pricey, though. For cheap delivery styles, I am a fan of Saluzzo's. Before I moved in with my girlfriend, my roommates and I probably ordered from there twice a week. They recognized our voices and new our "regular." Pineapple, feta, hot peppers.
Downtown Halifax also offers its denizens and vistors a little nexus of culinary debauchery known as "Pizza Corner." At the intersection of Blower's and Market Streets, right next to a perfectly sit-able stone and mortar wall that surrounds both the public library and a church, there are pizza places on three corners (King of Donair, Sicillian, and The European Food Shop), with an additional contender less than a block away (Venus Pizza). It's quite a sight on a weenend night, with dozens and dozens of bendy-elbowed partiers shoving down slice after slice, while seagulls circle overhead, waiting for the scraps. Venus is probably the least likely to give you food poisoning, and actually make a pretty decent falafel.