I have a player running the revised BM ranger, and it's pretty ridiculous. Easily pumping out 30-50 damage per round, on average, at level 6. 3 total attacks, 2 from the animal with boosted stats, plus a mark and *usually* sharpshooter. He's making the GWF Champion look pathetic. In another 5 levels, that animal is going to be doing an AoE attack against everything in reach...
The animal honestly feels like another player character, with all the stat boosts and overall combat effectiveness it has. There are definitely some balance issues, but we're too late to change that unless I manage to kill the character.
Sorry for quoting such an old post, I tried to PM you but I can't until I post 5 times. I was curious, how does the ranger in your game approach Hunter's Mark? It seems like it would be about half as effective without Extra Attack, but could free up the ranger to use concentration on other important things (like Controlling enemies with Ensnaring Strike).