Nope, the Halo enemies didn't really get smarter, their aim became beyond perfect. On Legendary they never missed. If you played with All Skulls On you had to play completely conscious of where to hide. And they had never ending 'nades.
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Nooooooo wrong wrong :( they definitely did get stronger but the ai in Halo without a doubt got smarter on higher difficulty. Just the way they group together and use cover and stuff really.
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Meh, marginally smarter, I'll grant that. The damn Elites did dive more, which was beyond annoying. The biggest thing though was their aim was perfect.