$30, for a bundle of two or three year old games just doesn't seem like such a hot deal to me. Obviously we just have different view points here. I follow most digital distributors with some regularity, and $30 is kind of the pricing I would expect for a game that is two/three months old. Hot Pursuit and Dead Space 2 hit that pricing already. Bioshock 2 was $5 yesterday, and Borderlands: GOTY wasn't much more. It seems silly that something like Killing Floor costs more than them.
Again, this is highly debatable. While there are some great older games in there like SMB and Audiosurf, I find a large chunk of the list to be pretty underwhelming. These are also the stock indie games Valve pushes at this point to me. They're great and all, but it's kind of shitty to see other stuff like VVVVV, Nimbus and Revenge of the Titans consistently ignored for stuff like this.
Cogs, Rush, The Wonderful End of the World, and Aaaaaaaaa, 1...2....3...Kick It!, and The Ball I find to be pretty bland, if not outright mediocre. And the rest of the games just feel aged to me at this point.
If I were to pick out the best indie games from the past two or three years I don't think more than one or two games from this list are worth mentioning next to stuff like Minecraft, Machinarium, Desktop Dungeons, Spelunky and Braid. There are a myriad of great/cheap indie games out there that even aren't on Steam.
Amnesia has been $4.80 before. (If you owned a previous Prenumbra title). I don't think all the sales are bad, but to get those deals you have to buy into a bundle with a number of lesser quality/incomplete titles.