Wulf Ratbane
Adventurer
Irda Ranger said:This is why multi-classing as a warrior-spellcaster sucks. A Ftr14/Wiz2 would have caster level of 2, but would be facing (in theory) 16th level opponents with a Defense rating of +16. His magic missile would be 100% useless.
One of the goals of 4e is to make "gish" builds useful and fun. A very good way to do that is to have a "magical attack" rating that's based on level/HD, not just caster level. I'm sure there are other ways to do it too, but using just caster level will not get you there.
If wizards get a "good" magic attack progression and a "poor" BAB progression, then it stands to reason that fighters may have a "good" BAB progression and a "poor" magic attack progression.
In other words, sure, you can "just use caster level," provided that Fighters get some non-zero increase to caster level.