Pat's a horrible actor and I really dislike his skits and hackneyed writing. I feel embarrassed for him when I watch them and, if someone were to walk into the room while I was doing so, I would probably die of embarrassment myself.
I enjoyed his flea market madness videos until he changed his reaction faces to go out of their way to show his flexed bicep somehow. They're still ok, though.
I listen to the Completely Unnecessary Podcast because I really like Ian. They're wrong about a bunch of stuff but it's ok. In the last one I listened to someone wrote in asking their opinion on Rare Replay fixing the Battletoads glitch and Ian had it in his head it was running out of lives for one player leading to a continue and level restart in a two player game, which isn't a glitch at all. Weird they wouldn't have ever heard of the glitch that disables the second player's controls during the Clinger Winger stage, but sure!
I assume he's popular because he's been around forever and not because he's particularly talented or charming in any way.