Valvoline has its fans on here, some guys swear by it. You'll notice BITOG has oil "groups". Some guys really like Mobil, some really like Pennzoil, others are into Quaker State or Castrol, some Valvoline. There are some Amsoil, Redline, Royal Purple and other boutique fans. There are those that just run whatever brand name oil is on sale

And some of the guys that really push one brand, will make it a point to put down another. I'd say the most commonly criticized brands are Mobil 1, Amsoil and Royal Purple. Mobil for being the largest, the other two for criticism of marketing style (Amsoil) and for absurd claims (RP).
I think Valvoline falls middle of the pack. Probably a little less popular than PYB, but a bit more popular than GTX. Its not that it a bad product. But it also doesn't really have any "exceptional" things going for it either. It lacks a flagship product like Mobil's 0w40, Pennzoil's 5w40 Euro, Castrol's TWS (or maybe Edge), which is why I don't think it gets the same sort of recognition.
Now these are just my personal opinions however, so take them as that only please.