There's a certain danger with channels specializing in one particular game, especially full-time 'Tubers.
They kinda have to keep liking the game the channel is based on, otherwise they lose their income.
Now, this is not to say that these channels can't be entertaining and/or truthful.
I have several channels favorites who are very vocal in their critique of a current patch, or what have you.
But generally speaking, there is an incentive for the content-creator to keep interest going in that particular game. If for no other reason, than it keeps people coming back to the channel for new tips.
Then again, I'm a cast-iron cynic. So keep that in mind as well.
Just....Caveat Emptor.