No, all skills go to 100. Major, minor, additional... And without fortifying them, they don't go beyond.
Oblivion was a massive improvement in the AI, yes, but it's nowhere near that level. A lot of people don't like the way Beth overhyped it.
But to be honest, Oblivion has more faults, most of which dwarf the AI not being as promised.
And Morrowind is limited in it's engine. Although since a way was discovered to get animations into the game a few mods have sprung up that add a more lifelike AI, it will never reach a really satisfactory level. Although I'll admit that I've never actually tried those mods.
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