The answer could be easily summed up as such. Do you plan on having to fight other Titans? Whether it's the Knight Titan, the Wraithknight, or one of the big damn Tau suits? Cause the answer would be...yes for the Exalted court. The answer might still be yes, even if you're blasting infantry off objectives. 1 less inch on that deviation can make a difference. 2 less on your WL, can make a HUGE difference. Not to mention you still have the Chainsword on that thing, and yeah hitting individual infantry with it...is annoying. But it's just as annoying when you miss all of them, and your stomps end up doing nothing as well. Then your big ol Titan is still in combat with a blob of 30 something guardsmen, or cultists, and you cry a bit.
Now if this is the entirety of your army...it really isn't feesible. Sorry to say, Titans by themselves are not a feesible army. It's just to easy to get flanked by meltas and blown to pieces. Or fisted...or Gauss'ed to death. If you have some sort of mechanicum or guardsmen milling around, then screw the ObSec on your Titans and have them crash head long into your opponents and "rip and tear."
Just my 2 cents.