I talked in chat a few days ago about fire being OP due to it's versatility.
cheaper and thus fastest PC
lots of CC
one of the best(if not the best) direct damage spells
the best mono alternative quanta gain card
high dmg creatures
now how are you supposed to make a good deck against fire stall that will do good against most other decks?
Farenheit deals physical damage, so using reflective shields won't help much against it, also in case you use a reflective shield, bolts are still very useful CC
if you use a regular shield, let's say phase shield, fire still have the cheapest cc, and most decks will have a few good deflags, and if you manage to keep that shield up, it won't stop bolts.
the creatures have low health, but still killing a phoenix(for good) is usually a pain, and let's say you turn that phoenix to ashes and lobo it, so it won't rebirth again, the opponent can still cremate it and get 7~9
quanta to put down some brand new creatures or to increase his bolt/farenheit hits , not to mention that at the same time you'll generate 1 of each quanta, that can be used to incrase the dmg by poison, purifiy yourself, stall with sundial...
Now about how to counter them:
I'd use death, skull shield is more effective against low hp creatures and would solve the phoenix problem, also it's beautiful to use a bonewall and see the stupid ai using RoF on your creatures, deflag isn't that effective against bonewall, you can make pretty good rushes with death, good poison stalls and also maybe make a duo with darkness for some nasty stealing action