MTT was a protege of Leonard Bernstein and, like Bernstein, is given to somwhat flamboyant conducting style -- not as severe as Bernstein, but in that general mode.
Like Bernstein, IMHO, these theatrics appear to serve the music, and MTT, like Bernstein, is a great conductor of Mahler.
Living in SF, I've had the opportunity to hear him perform many times. His Mahler is sometimes great but always very good. His Bruckner is quite good as well. He's good with modern and contemporary repertoire and gives good readings of Mozart and Haydn (though not my favorites).
All in all I think he's an underrated conductor who deserves more credit.
And why the reaction to visiting SF, Spatula??? I'd really be curious to know what causes your "reluctance" to visit. SF is a favorite destination for a heck of a lot of people, including Canadians, and, outside Vancouver (maybe), it is the most beautiful city on the North American continent. It's friendly, open, inviting. Give it a try; you might be pleasantly surprised!