3e multi classing was the biggest problem of that edition, I remember sitting around a table with guys who had characters with FIVE! different classes roles into their characters... FIVE! I kid you not. And it lead to so much headaches and cookie cutter behavior that it rendered the game unfun to me.
My favorite multi classing system is 2e, I loved playing elven fighter/Mage or Dwarven cleric/rouge it also left my character grounded in itself and I couldn't just grab levels from any class that I want (regardless of how I got that level) just because some of its abilities caught my eye.
Warder
Cant XP ya soz. Ah well...
This is my experience as well exactly. I actually pulled out some video of when I was a younger man around the time 3e first came out. Sure enough, me an my friends sitting at the table, with me going on about 3e multiclassing as if it was the best thing to happen to RPG design ever.
Here I am now, 12 years later, and Im eating my words. Im so over it. It never got back to that really cool multiclass feel we got from out 2e campaign. In the end, it was just another power option tool to be abused, and abused it got.
No-one multiclassed because they wanted the character to feel a certain way...they just multiclassed to access a certain feat, or spell, or bonus, or prestige class. It never in all our play worked as a tool to reflect intention, it was just a min/max mechanism.
Multiclassing has never been perfect, but (for me at least) 2e was where it best reflected intention.