I think his first lines talking about Jarvis Jones are damn near spot on. [youtube]0rLOEvYULfY[/youtube]
Frank Caliendo is amazing at impressions...he's just not that funny. Yes, he gets the voices right (mostly). But he has nothing funny to say or do otherwise.
Decent on MAD TV, and hilarious when I first heard him on John and Lance, but never learned how to write jokes: other than his John Madden "Aikman's contacts" line. Although that's possibly because $100k on a one-time Sportscenter or Fox NFL Sunday appearance is better than (per Maria Bamford) $50k after taxes, agent, lodging and travel for a year on the road.