I used magic missile as the example because it is pretty much the conventional wizards basic attack spell at low levels. The Arcane Thesis version is 50ish damage that requires no attack roll, can be split among targets, has no saving throw, and essentially is unresistable. Unless you have Shield, or the necklace thingy...or happen to be a force dragon.
... unless arcane classes have become completely unpopular because of the introduction of psionic classes.Strikes me, that with magic missile being so popular, it is a waste to spend so many feats to enhance it. The popularity of magic missile ensures the commanality of shield, brooches of shielding, and the like. Metamagic feats increases the damage per missile, but not the number of missiles. IMX, at least half the players equip their characters with brooches of shielding.
The 4th level Magic missile doing average of around 50 force damage is a good example. Way to much damage for such a low level spell as a 7th level character. Make it worse with a Scorching Ray...9th level caster doing around 135 fire damage with a 5th level spell slot. Thats more damage than a Meteor Swarm on average!
I didn't do the exact math which was why I said 'around'...So 25 base + avg of 17 more for 42. I think in my head I originally multiplied the roll by 1.5 like you normally would for just being empowered. Cuz that would be right at 50 pts. I still think that's too much automatic damage. IMX brooches of shielding get sold as soon as they get found. The low hp casters have shield, and everyone else begs to be hit with direct damage rather than the jillion other nasty things casters can do. That or they are way more worried about wearing their amulets of health or natural armor (or both).
Granted direct damage spells are usually not the best choice in combat...but that doesn't mean making low level spells do more damage than 9th level spells is balanced.
I personally consider the orb spells borderline broken, and they are essentially banned in all games I have been playing in. Along with Wraithstrike, the Dex damage touch attack that 1-shots great wyrms with no save, and a few other things.
I didn't do the exact math which was why I said 'around'...So 25 base + avg of 17 more for 42.
...but that doesn't mean making low level spells do more damage than 9th level spells is balanced.
25 (maximized) + 6.25 (average addition from being empowered*) = 31.25 average