Most helpful gaming sites/channels?

[HoloDust]

There are many review sites/channels, but I'm thinking more in line of something like:

HowLongToBeat.com, which is invaluable for checking how much time is required to finish a game, both for main story and side content

Co-Optimus.com for checking all sort of co-op experiences, depending on filters set (local or not, split screen, number of players, platform, genre...)

Meta/Open-critic (with all the caveats)

MobyGames.com for probably most comprehensive database on video games.

Any other contenders?