Is Valve's latest "new" IP DOTA2 successful when compared to the other set of MOBAs that have come out over the past few years?
Have Valve's forays into VR and hardware been successful compared to other companies in the space? e.g. the Vive, Oculus?
Looking at Steam itself, has the service dramatically improved since launch? Certainly there have been a lot of good incremental updates, e.g. two-factor auth. But the Apple App Store has seen a lot more updates in terms of search, discoverability, etc.
I am not an expert, and may have my details wrong about Valve. But I don't think the company has been especially successful outside of being the only game in town for buying AAA video games online.