range 20
+200 gold = all minions killed
you are not forced to take it... but it is better than you make it...
there are times when the party can just use the surprise round to blast the enemies at range, when they are in a formation or whatever...
it is not the typical balanced encounter, but it happens
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(except when you play put your creatures on the battle map and start rolling kind of game)
edit: a fountain at an open place is wasted...
fireball is an outdoor spell... it has always been...
I just think you are evaluating fireball outside of a reasonable context...
Spend 200 gold when you cast it?
When the context is that for a standard level 5 party, the Wizard's cut of the gold for the entire level is 400 gold... That doesn't seem reasonable.
No, you are not forced to take it, and no it isn't worthless.
However, in the context of choosing between fireball and other level 5 wizard spells, it is bad.
It is bad like a +3 sword is "bad" like if the DM says "you can have a +3 sword or a +5 sword, pick one". Yea, the +3 sword isn't useless, but in the context of choosing one, it really is the bad option.
You can choose the +3 sword, you can get it done with the worse option, but the rest of the party is going to have to pick up your slack. If the whole party picks +3 swords instead of +5 swords, then it generally leads to combat dysfunction and the DM gets a headache.
When my level 5 wizard is sitting there with a spellbook containing Stinking Cloud, Vision of Avarice, Magma Beast and Fireball... Fireball never gets picked. If I'm going to fight some dudes with a lot of minions on a field somewhere, I'll break out the stinking cloud every time.
If you want fireball for roleplaying reasons, there there isn't any reason in the world that your roleplaying would be harmed one bit by WotC making fireball stack up to the level 5 wizard spells on a mechanical level.