I disagree. Shatner is the King. Of course it's cornball to some degree...everyone knows it...even the Shat does. And, like him and fans of his performances, I embrace the cheese, and have even learned to LOVE it.
I posted this youtube link in another thread:
http://www.youtube.com/watch?v=mWWJuuF_mM0
Classic Shatner...to me...that's
awesome.

Anyway...I have no idea what he's like personally other than how he has portrayed himself as in various media (in which he seems like, at least at present, a pretty nice dude), so I can't say that he's a wonderful all-around guy. Sound like he's certainly stepped on some toes in his professional life.
But performances like the one above...Trek would not have been as cool as it was without those moments IMO.
-Rabittooth