Newt Gingrich is simply the most interesting orator, most interesting speaker in the Republican party ranks today. Survey a thousand Republicans and ask them which speaker they'd most likely turn out to listen to - I'm convinced Gingrich would be the name most often mentioned.
That is not to say that Newt would be the best presidential candidate, clearly he is not. Gingrich is the most interesting Republican, not the most sound, and there is a difference. He's a dreamer, a thinker, a futurist, and a prolific author - bright as anything, but not disciplined or a particularly good manager.
So the answer is yes, I'd go hear him speak, but I probably wouldn't vote for him. I have that same reaction to Sarah Palin, another firecracker speaker, in a different way.