$5.99 is a fair price. If the game is not worth that price to you, wait for it to be a dollar and some change on sale.
There are always complaints about the price of every game released that is not 1-2 dollars (thanks to Steam's sales devaluing games for customers), at which point people will complain the game should be free (which is what people think all old games should be, sadly).
Edit: The last sale had a lot of the $5.99 games on sale for ~$1.20. There should be a sale this winter, so throw the game up on your wishlist and wait for then. Hopefully we see it go on sale. :)
Post edited August 07, 2014 by Ashkc88