Games should be divided into 2 sections: Valve-approved, and User-approved. For example, a separate tab for "Greenlight Games" with its own charts and promos and such.
If a User-approved game is successful enough in terms of sales, then Valve can move it to the normal game section at their discretion.
Games from the user-approved section should not appear in sales/promos/release lists/etc. in the main section, only in their own section.
Early access games should appear only in the user-approved section until they reach a finished state.
Valve should have several people who are responsible for approving games, rather than just 1 guy doing it part time (as before) or outsourcing it to a group of people (the community) that doesn't have the knowledge/experience to evaluate game concepts and the developers behind them. These people would meet regularly, present games to the group, and vote on which ones pass. Games that did not pass could still get into the user-approved section through the Greenlight process.
There also needs to be a delisting process for games that don't meet benchmarks, that stay in early access too long, that renege on too many promises made in the greenlight phase, etc.
I see Valve's flirtations with various approval processes as reactionary and unprofessional. They need to quit trying to please everyone and do something that will work in the long run for both players and developers.