Never saw Click. Previews didn't do anything for me and, as mentioned, I'm just not a fan of Sandler to see a film of his just based on him being involved alone.
But the king of unfunny movies (to get away from Sandler) is Nacho Libre. I stand by my opinion that Napoleon Dynamite is just a random, mostly unfunny mess, but it still gave me a few laughs here and there. Nacho Libre didn't even get a chuckle from me so much as once throughout the entire film, and this is coming from a Jack Black fan.