The problem with fireball isn't that its damage only, its that for a wizard its a crappy damage only spell.
The main reason is its a single blast, over and done with. Most good wizard dailies last the whole fight.
Look at the wizard's 1st level daily (Flaming Sphere).
The sphere does great autodamage that lasts the whole fight. I can kill minions with it, I can add terrible damage to a solo, or I can just roll through groups of monsters and do damage.
4e combats last long enough that the damage over time for Flaming Sphere is much greater than that of fireball, and you have less chance of scorching your friends.
I will also say that I considered fireball weak when I compare it to wizard dailies (who have the best dailies in the game) not to all dailies. If a sorc had fireball he would be happy.
But wizards get the really good dailies so its important to consider that (also the reason I didn't understand giving half effects to wizard encounter powers...I don't think they need it but that's another discussion).
The main reason is its a single blast, over and done with. Most good wizard dailies last the whole fight.
Look at the wizard's 1st level daily (Flaming Sphere).
The sphere does great autodamage that lasts the whole fight. I can kill minions with it, I can add terrible damage to a solo, or I can just roll through groups of monsters and do damage.
4e combats last long enough that the damage over time for Flaming Sphere is much greater than that of fireball, and you have less chance of scorching your friends.
I will also say that I considered fireball weak when I compare it to wizard dailies (who have the best dailies in the game) not to all dailies. If a sorc had fireball he would be happy.
But wizards get the really good dailies so its important to consider that (also the reason I didn't understand giving half effects to wizard encounter powers...I don't think they need it but that's another discussion).