Yes, Isekai became really popular lately.
Re:Zero is one of the best. Can't wait for the second season.
As about Tate, yes. I am watching it. I like the story. Another ones you can give a go are That Time I Got Reincarnated as a Slime and Kenja no Mago.
When I really first started watching cartoons like around 4 years. Anime owns. The stories, graphics, and evey thing else that make anime what its is.
I'm not against the Isekai argument as long as the main plot is good like in Re:Zero. I haven't watched isekai quartet yet, i'm really curious how they pulled out that.
I've seen both seasons of Isekai quartet and its so fun and great to watch each episode. I recommend it if you enjoy most of its composed series.
But yeah, I enjoy Isekai in general, though I've noticed a lot of animes based on it, which is getting a bit much, though the best I've seen so far is konosuba, Overlord and Rezero.