I don't have issues with any of the spells... I only have issues with my players and their decisions on which spells they choose to take.
Is
Fireball "overpowered" compared to other 3rd level spells? Yeah, maybe, but that doesn't bother me. What bothers me though is the player who
says they want to play a Necromancer in theming and background... and yet throws nothing but
Fireballs during combat because it's the "best" 3rd level spell. To me, if you want to play a necromancer, play a necromancer! Use necromancy skill in all kinds of interesting and cool ways! You do so, I will be helping you out as the DM to be the most interesting and best necromancer ever!
But I won't usually do that if you just default to a metagame idea of "I want to make sure we win at all the combats!" by just throwing
Fireballs and
Lightning Bolts more than playing a thematically consistent character. That's the easiest way for me to just shrug my shoulders and lose interest in your character's progression through the campaign. I'm fine with you playing your character that way and won't stop you... I just won't be all that enthused about trying to spotlight your PC at various points in the story because there's nothing to hold onto.