It's too bad things didn't click as well with Serious Sam 2 as they did with the first ... two. I've been tempted more than a few times to go back and play them recently. Considering what the games were, I imagine they've aged fairly well.
Edit: About being "cute," I think the message that the game was trying to get across is still just as valid now as it was eight years ago. Not every great game needs a big budget or have some sort of artistic value. Sometimes, it's just good to have something completely ridiculous and fun (and not crazy weird Noby Noby Boy style). The only difference now is there are a lot of other developers out there doing the same thing, but it seems the other side of the argument has gotten more entrenched as the "AAA" titles have become more bloated. Serious Sam was part of the spearhead in the sort of retro/just fun movement that's happening now. It's nice to see it survive in some form.