Yes, quality is a function of quantity. This applies to all kinds of things besides games such as the relationships between friends and family members. The more time you spend with someone, the more likely a certain percentage of that time will be of high quality.
I think the level of quality has also increased compared to pre-2005.
Games like Factorio and Minecraft didn't even exist. It's not a stretch to call FTL and Spelunky the best rouge-like games so far. Ocarina of Time, even with its huge nostalgia bias, is less re-playable than A Link Between Worlds. CS:GO basically amplifies everything good about CS 1.6 and CS:Source then adds the competitive support. Similarly, DOOM (2016) takes everything (Except perhaps the mod-ability and level design) that made Doom so good and improves it.
Doom4 is fantastic for those of us who grew up on Doom1.
OOT is a classic simply because of its weirdness and innovative time mechanics, but I prefer the bright joy of Wind Waker and the more recent Twilight Princess is just better in so many ways.
Many people (myself included) would argue that CS:GO is worse than 1.6 or source. CS has always had competitive support by nature of being able to host your own servers.