I was in a 325 for four years, 2 in the E36 and 2 in the E46.
I kept telling everyone that the power was 'good enough' for me... Now that I am in my ///M, I know they must have been laughing when I left our meets and drives.
I, also, had never driven one... Then I did, just like everyone says...no comparison. But to each their own...
Go drive one, really drive one, then if you're not sure... DRIVE ANOTHER ONE.
If you're still not convinced...enjoy the 328 like you have been.