Valve isn't the same company they were back when they developed things like HL2. They've basically been sitting back and sucking up money for a long time. They're good at that, but there's no indication they're good at anything else at this point.
I'll go out on a limb and say this game is going to suck, and after the initial hype people are going to hate that Valve did this.
You mean apart from creating and still consistently updating CS:GO and DotA 2, which are both some of the most played games in the world?
Their "The Lab" VR demo, which is a collection of mini games, is also one of the most enjoyable VR experiences, so I'm very optimistic they can make something great again if they put their mind to it.
Yes, I mean exactly those games, which are neither new nor ground breaking, and which were originally authored by outside firms/contractors, not valve. Since then, most of Valve's additions to the games are in the form of monetization.
If you didn't notice the news articles, they even laid off almost all the people responsible for HL2 and its episodes, including the writer.
Valve has also released DOTA Underlords and Artifact in the two years. With HLA and Underlords Valve is actually releasing two games this year.
Yeah Valve has barely made any games this decade.