I haven't tried the poison deck, but I imagine it (poison) is probably a bit faster than this (fireball). This fire deck CAN win in 5 turns, however it is extremely rare (so rare that I don't think I've ever had it happen, I have won in 6 though). I would guess most often that wins come around turns 9-11 (by this point, even if your Fahrenheit has done no dmg, you should have some combination of the 4 bolts + 81 quanta, or 5 bolts + 63 quanta that you need to win). The fire may have a higher winning percent than the poison, but may also take a bit longer. Overall I am sure the poison is a "better" deck, since this fireball deck is wholly dependent on the fact that a) no Top50 decks have reflector shields and b) the AI never destroys upgraded sundials.
The Poison deck wins, on average, in 6-8 turns, 9-11 turns on very rare occasions, and I've won in 5 turns twice. It IS faster on most occasions, but the deck that I've seen uzra play, which is very similar to this one, did manage to beat me by one turn because I kept drawing congeals (he had 20+ poison counters, and was at lower than 15 HP, I believe). Overall, both decks are very good at what they do, but likewise, they both have weaknesses. Poison is taken out by a single early game Devourer/Pest, and the Fire Lance deck is easily taken out by any type of reflecting shield.
I've tried both in the past, then decided to try something more funny (flying weapons) just not to get to bored in grinding. But I must say fire wins more than poison: it doesnt care about creatures at all and fears only reflection (wich i must say is SO rare in top50, i met only a jade shield and only once). On the other hand poison is faster in turns, but fire is more mindless play and no abilities to use.
In the end I would play fire because i believe in murphy's law: "the time you lost was the time you would get a rare" ;P
Down here my flying weapons deck: lot of control, possibility of masteries (miracle+strolen bond, or just having an early bonewall) and tends to 100% effectivness, but can have troubles against fast decks (poison/fire) with bad draws. note that i replaced the bond in the picture with a miracle to get easy wins even agaisnt those fast damaging decks.
So what's the prolem? It's slow :|