WizarDru
Adventurer
This would be the first time I've heard that someone thought SR was broken. Nothing wrong with that, but I've got to admit, of all the hot-button topics of 3.0....this one never even made the top 20. 
The spellcaster has plenty of control over his affect on a creature's SR....he takes a specific feat, casts a spell that is unaffected by SR or chooses a higher level spell. Grazzt should laugh at Melf's Acid Arrow, and under the existing system, he does. He should NOT like Maze. And he doesn't.
Some creatures are just going to be difficult for a spellcaster to deal with, if they're not designed to deal with them. Golems are natural-born mage killers, by design, but I don't hear anyone lamenting an Iron Golem's immunity.
At the levels where SR becomes an issue, most spellcasters have more than enough spells to deal with most situations. As other have pointed out, hit points are also a finite resource as well. Further, it's also been pointed out that a good spellcaster should have more than one way around SR. Buffing non-spellcasters or their weapons is one approach, using spells that don't target the SR creature is another (such as wall or summoning spells).
I could only see SR as a problem is you always expected a spell to land, regardless of the target. I don't much like the idea of SR making a spell an automatic save, since that hurts the spellcaster as much or more (SR 15 is easy to attain, particularly at high levels with holy/unholy aura) and makes some spells no longer worth trying.

The spellcaster has plenty of control over his affect on a creature's SR....he takes a specific feat, casts a spell that is unaffected by SR or chooses a higher level spell. Grazzt should laugh at Melf's Acid Arrow, and under the existing system, he does. He should NOT like Maze. And he doesn't.
Some creatures are just going to be difficult for a spellcaster to deal with, if they're not designed to deal with them. Golems are natural-born mage killers, by design, but I don't hear anyone lamenting an Iron Golem's immunity.
At the levels where SR becomes an issue, most spellcasters have more than enough spells to deal with most situations. As other have pointed out, hit points are also a finite resource as well. Further, it's also been pointed out that a good spellcaster should have more than one way around SR. Buffing non-spellcasters or their weapons is one approach, using spells that don't target the SR creature is another (such as wall or summoning spells).
I could only see SR as a problem is you always expected a spell to land, regardless of the target. I don't much like the idea of SR making a spell an automatic save, since that hurts the spellcaster as much or more (SR 15 is easy to attain, particularly at high levels with holy/unholy aura) and makes some spells no longer worth trying.