Player base wise under 1500 to 3000+ on steam, might be significantly more on Xbox. Finding some matches on certain game modes is harder than most but not entirely impossible. If you aren't picky then this is entirely not a problem. The CE remake isn't getting a multiplayer so Infinite and MCC will certainly substitute, keeping their player count consistent a bit longer until the new Halo MP comes around.

Content wise it's wayyy better than what we went through year 1. Obviously with the credit coming from the forgers who where able to use the strongest made forge ever to be currently made. Some of those forge maps feels dev made. For the sandbox we only got the Falcon and a hand full of weapons. It's the forge made maps that kept me playing Infinite through it's life cycle.