I don't think it's a bad thing to be able to have properties of all three. It's about Character Development, and to actually Master all three would take dedication to your character. I have never really used magic much. I had Conjuration as a Major on my best Character and that was level 40 for the majority of the time. In Oblivion I hope to use all three as I want a dagger and an axe, some strength and some speed, and some stealth with some fire. Sneaking through the woodland with the new "Detect Life" and "Chameleon" spells, ready to ambush your quarry with a claymore is what I'm aiming for and I guess that's a bit of everything.
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