I only read the first half of the first page so sorry if i repeat others points...but,
My favorite things about this site and why i come back are...
1. All of the charts, as a big math geek i love being able to look up game sales data and make comparison graphs of different consols, ect.
2. The forums, as this site is (or was) smaller it has a less blatant fanboy bias. I mean don't get me wrong, i love nintendo but i hate going to forums on other sites and seeing nothing but flamebait....it's boring.
for improvements...
1. anything to increase the options for accessing and displaying all of the wonderful data would be great. just things like picking the number of consols to display while graphing (sometimes i want more or less) and things of the like.
2. maintain the awesome forum community, no advice on how to do that and the more people come the worse it will be become i'm sure.
3. avoid anything subjective like reviews. the sales are the core of this site so don't discredit those data by making any opinions about any of the systems/games/ect.
all and all i like this site. just keep doing what you do and make sure any expansions are expansions you want to do and true to yourself and the people will follow. xD
