I have to admit that these aren't the most scientific of rankings. I mostly went from memory (with only a couple of places being added after I made the list), so I could have mis-ranked a few pizzerias, especially towards the middle-to-bottom of the list.
Emphasis in my rankings is primarily on taste. Value, service, the overall experience, etc. are also important to me.
With that out of the way, here are my rankings (with some random notes):
Di Fara (Midwood) - Re-read my emphasis above. That this is still number 1 despite the poor value and atrocious service is a testament of quality.
N 28 (W Village) - I normally go for plain slices, but this place is all about the variety.
Artichoke (Union Sq) - I wasn't a believer at first. It's all in the sicilian.
Patsy's (E Harlem) - I think most would disagree. I've had Patsy's numerous times, under numerous circumstances. With that said, I might chalk it up to a small sample size.
Carmela's (FiDi) - May this place rest in peace (dept of health). I would eat off their bathroom floor if I could have one more chicken vodka slice. But alas.
Giovanna's (UES) - Barely distinguishable from Nick's (UES). I gave it a slight edge for crispier crust and more basil.
Nick's (UES) - See above; I have yet to try the original location.
John's of Bleeker (W Village) - Very good brick oven that I haven't had in several years. Who knows, I might rank this above Giovanna's if this were a more exact science.
Vinny Vincenz (Union Square) - Better regular slice than Artichoke, but I don't think the sicilian compares.
Joe's (W Village) - Still a top-notch plain slice.
Fornino (Williamsburg) - I was torn about where to rank this one. I'd have to try it again, but it might belong a few spots higher.
Gotham Pizza (UES) - They did a slice write-up on this place. At first I was kind of surprised, but I really do like this place.
Mardigras Pizza (FiDi) - Two Boots knock-off that's better than the original.
Il Fornaio (UES) - I don't know why I like this place so much. The pizza is a little doughier than I usually like, but it just tastes good. Who am I to argue with that?
The Grotto (FiDi) - My go-to pizza place at work.
Pizza Box (W Village) - I've only been once, so maybe it was on an off-evening. I was expecting this to be better than Joe's, but it was just decent.
Pintaile's Pizza (UES) - Kind of different (organic wheat dough, unique toppings), and I wasn't sure whether I liked this at first; but I do.
99 Cent Fresh Pizza (Midtown East) - Not only because it's cheap.
Crocodile Lounge (Union Sq) - Floury crust, but for some reason* it all works together.
* One possible reason might be the dozen Natural Light adult beverages I drink before heading over.
Adrienne's Pizza Bar (FiDi) - The epitome of overrated. Decent place that way-too-frequently gets nods as a top Manhattan Pizzeria.
Pizza Italia (FiDi) - Above-average slice place by work.
Tony's Famous Pizza (Downtown Brooklyn)
Libretto's (Murray Hill)
Rosa's Pizza (Murray Hill)
Pizza 33 (Murray Hill) - Pizza 33 : slightly past their prime Phi Sig girls :: Adrienne's Pizza Bar : Balding AVP's in Prime Brokerage
Underground Pizza (FiDi)
La Mia Pizza (UES)
Delizia 92 (UES)
Rocky's Number II (Murray Hill)
Mike's Pizza (UES)
Bulldog Pizza (UES)
Slice, The Perfect Food (UES) - I almost excluded this. I really like some of the food here, but I hesitate to call it "pizza". I would loosely lump this in with The Pump (which I did exclude--it's even less true to its name) as a tasty and healthy alternative, but it's just not pizza. It's also pricey.
Vezzo (Murray Hill)
Two Boots (UES)
Ben's Pizza (W Village) - I may have to re-try this one. It's been a while and I've heard a few compliments.
Pinch (Murray Hill)
Famous Original Ray's Pizza (UES) - Better than I expected.
La Pizzeria (Murray Hill)
Pizza Mercato (Murray Hill)
Little Vincent's (UES)
Nina's (UES) - I am not opposed to the thicker, pan style of pizza, but something was just off about the flavor.
Mimi's Pizza Kitchen (UES)
Fat Sal's Pizza (UES)
My Daddy's Pizza (FiDi)
Imperial Pizza (Murray Hill)
Da Vinci (FiDi)
Piazza Pizza (UES)
Zesty Pizza & Deli (UES)
Zorba's Pizza (UES)
Famous Original Ray's Pizza (LES)
Roma's Pizza (UES) - Gross. Still, I often find myself hungry at 4am with nowhere else to
turn. This is roughly the cut-off line, below which I wouldn't eat a slice for free.
Abitino's Pizzeria (Midtown East)
Hot & Crusty (Multi)
Bravo Pizza (Midtown East)
Caesar's Palace (UWS)
B&T Supreme (UES)
Redstone Pizzeria (Midtown East)
Pizza Rustica (Midtown East)
Park Row Pizza (FiDi)
Caruso's (Penn Station)
Mariella Pizza (Midtown East)
Giuliano's (FiDi) - I admittedly have a vendetta against this place. 95% of it is because they serve horrible pizza, though.
Cafe Amore (Union Sq) - Puke