I suppose at higher levels, I won't be melee fighting anyway, I'll be casting
this, i belive, is a mistake! yes, i played a ftr/mage in BG1. yes, he was a pure spellcaster with a brutish avatar, some better HP's and a bow, which he used to kill kobolds and such. yes, my first SoA char was a kensai/mage. he was the only mage in my party and yes, i did treat him as a high-HP spellcastrer . untill i got another mage in my party. that's when i realised dual- and multiclassed warrior/mages are MUCH MORE than this.
they are the ultimate TANKS, just having a different "finesse" approach about it - where a beserker will scream in rage and charge into combat, gutting out the damage and hoping to protect himself with whatever his rage protects him from, a fighter/mage will have researched, experimented, and applied the best protection/preparation for that kind of enenmy, be that at the beginning of adventuring day, before or in heat of battle... only to emerge unscratched from the fight, with 3/4 of his buffs still active, and enmies' pieces still landing from his killfest...
there's an old saying, by Napoleon, or maybe Alexander the Great: "a general only enters battlles he has already won". in many aspects, the fighter/mage is the D&D implementation of this phylosophy...
roleplaying- AND powergaming-wise (and it's not often thes two converge, is it?

) a dual or multy fighter/mage should be a well-prepared frontliner, focusing on self-buffs and !!!BREACH!!!, while leaving the nuking/enemy croud control/party protection to someone else... and only then his full potential will be revealed!
* actually, i'm not sure about who DID say that thing about winning battles... can anyone enlightem me?
*wink* fable *wink*