I am currently visiting family and sat down with my brother to play Gauntlet Legends for the N64. I was having a blast and started wondering, "where did games like this go?" I suppose I am looking for couch co-op 3D arcade hack and slash. As far as I can tell, that hyper specific genre disappeared about 16 years ago.
The Gauntlet franchise seems pretty dead - Gauntlet: Seven Sorrows was released 17 years ago and was apparently met with mixed reviews.
I remember having a great time with the BG: Dark Alliance games, but those also seem dead. The last one came out in 2004.
Castle Crashers came out 16 years ago. It was great fun, but seems closer to the 2D beat em up formula.
I have not played the Dynasty Warriors games since maybe DW3, So perhaps that is where all that 3D hack and slash energy went.
I have used co-optimus to find co-op games in the past, but digging through that is sometimes hard if you don't know what you're looking for.