I did not get Half-Life 3 yet.
But on a serious note, we don't know how successful they actually are. They are a private company. Concurrent players & logged in users growing, with more and more gamers around the world and covid as a catalyst over the last years is probably not a good sole indicator. Those are growing for everybody, just compare them to Roblox alone.
I'd say maybe a better one could be pretty much every publisher returning or rumoured to return soon - but that could also just mean better deals for them and Valve also not making more money.
Besides that, doesn't seem all sunshine at Valve either. There were reports of a hostile work environment in the past, among other things supposedly due to the ego-fuelling bonus structure.
When Alyx arrived GabeN talked about how they'll ship two more big VR titles soon-ish, which didn't happen and which supposedly are at least on hold. We at least know that they currently work on a non-vr game called Neon Prime right now and that might or might not ship soon.
The Dota 2 and especially the CSGO community wishes for more communication and updates for their games. The Source 2 update for CSGO has more people coping now than HL3.
They let games like Artifact and Underlords just die. Especially Artifact, with being a buy-to-play title where you additionally had to buy the cards for additional real money, had quite some controversies around the game and how Valve handled everything.
At least in CSGO the esports scene is also not happy either with how Valve ignores and handles cheat & fraud cases half-assed. Their own anti-cheat in CSGO is also still shit.