I started playing for the first time when the immersion patch went live. From what I understand about their loot-shooter, gear score mechanics, immersion is much closer to what I'd expect from a Ghost Recon game, but I still find it really lacking.
The story thus far is interesting, but the world just feels empty. Bad guys are in no short supply, sure, but gone are almost all the civilians from Wildlands; no peaceful towns, people walking along the roadside, and the only vehicles you see on the road are hostile, who now immediately identify you as an enemy even when you're driving calmly in one of their own cars. All subtlety and depth seems to have been stripped.
Game mechanics are oddly clunky. Hopping on a ladder causes your character to look to the side momentarily before you're given control and allowed to climb. Sliding down a ladder requires you to hold control for a duration before you start to slide, instead of just sliding if you're holding control. You can't shimmy back from a ledge while lying prone because your character turns all the way around instead. Gunplay at least remains pretty satisfying compared to Wildlands, but I think that's mostly because they didn't really change anything.
About the only real improvement that comes to mind is in character animation--facial features and mannerisms--but even there the cracks have begun to show with poor lip-syncing and awkward pauses and bad dialog. And sweet holy hell, the repetition in non-story NPC dialog is so annoying. If you stand near NPCs for 30 seconds (changing gear or settings) you'll hear the same 2-3 voice lines repeated several times. They just don't shut up, even when they're alone.
All in all, it's an inferior product to Wildlands. Where I wish they'd retooled the game for a more hardcore route, they seem to have gone the opposite direction. Immersion is a step in the right direction, but I think the game itself is fundamentally flawed and will never live up as a sequel.