I never really watch any of these, but I watched GrayStillPlays once, and found him to be enjoyable. I often gravitate towards absurdist humour, games of which he often covers on his channel.
...A few playthough channels once, I guess, a long time ago. A very long time ago. Huh, those were back in the days of the 3DS, perhaps even before then. Once or twice, I watched full runs of games I've never really played. Some looked cool but I doubt I'd ever end up playing them. Especially now all those consoles are gone; if I ever were to play them, it would likely only be through if they got rereleases. And that seems like a very slim chance.
Other than that, no, I rarely watch gaming channels. Occasionally a news or review channel but that'll be about it and usually only one-offs. GrayStillPlays, though, maybe I should see what he gets up to now. I'd recommend him to anyone reading this thread, I suppose.