He doesnt have enough Mp to last every fight.

A level 12 BM (pretty good time to go after Lich) has 18 spells total. Saving one FIR3 for Lich leaves 17. That's enough magic for me to make it to Lich. Depends how much you wander around, I guess.

WOW he doesnt get NUKE! Instead he gets good Hp,defense and attack power. Something a Bm will never get! Personally I rather have all 3 of that than 2 casts of Nuke.

I'd rather have NUKE, so there you go. BM isn't useless if you value NUKE, and I do, and apparently a lot of other people do too. Not to mention all the other spells a BM gets that an RM doesn't.

Well yeah but you see the Rm can do that too. But once he runs out of magic he can attack and become usefull. Unlike the Bm who attacks for 1 dmg.

I assume you're exaggerating. BM does more than 1 damage for most of the game.

But like I said I would rather have a character who can actually DO something after his job of casting magic is done.

The job is never done.