Well, you can buy them but truth is you'll probably won't play them. It's not about if the games are worth your money but if your games are worth your time. Money is one thing, but lifetime is the most precioust thing you got. When I look at that list I say...sorry, but no. It's all about quality, not quantity.
True, but I'm always interested in trying out new games. (And seriously, I understand the concept of "But will you ever have enough time to play all of the games?"... If you saw my Steam account, (or any of my game libraries), you'd see the ton of games I have.
I like bundles. and sales.
During one of the Steam sales, I bought the Square Enix complete pack for cheap, primarily because I wanted Batman Arkham Asylum. But I ended up being really glad I got it, since I've since put in over 100 hours into Just Cause 2, which I never would have played would it not have been for the bundle.
So even if I find only one unexpected good game in the bundle, for $15 is insane to pass up.
Hmmm.. Looks like I have a number of the games already (from various other game bundles, or whatnot), so even if getting the bundle is just to make sure I "collect 'em all" that's fine with me too.
(That sounds like I have a serious problem, even to me. haha)
But I don't have Star Wolves, Penumbra and Cryostasis. At the very least, the $15 bundle is worth getting based on Tony's recommendation of those.