Yeah I left off on The Master Chief Collection having beaten all but Reach on Heroic, and was a little ways into Reach on that mode.
Before I answer your questions, some good news on performance and graphics settings. I looked at Digital Foundry's recommended optimized settings based on a few GPUs. One of them was the 2060 Super, which is close enough to my 1080. At first I thought the settings were way too high from what I had experienced, being mostly High, with Textures, Terrain, Effects, and Anisotropic Filtering set to Ultra, and Depth of Field set to Med.
During a lot of my previous testing I had Async Compute set to Off though, and DF said you get a bit better performance with it On. Other than that, they highly recommended setting Minimum FPS to a decent amount. They exampled 60 Min and 60 Max settings, with Vsync On, which is what I tried. Lastly, they claimed this should all be possible on that level of GPU, at 1440p Resolution Scale.
Needless to say, I was very doubtful. My first attempt at these settings surprisingly involved no lag problem. I mean I didn't even see the res looking like it was being compensated by the high Min FPS setting. However there was TONS of flickering, mainly light sources. I tried compensating some of the more demanding settings, but still the flickering. Then I went back to the DF settings, and this time quit the game AND rebooted the PC.
The result was incredible. I can now play at these settings, which look fantastic btw, with no flicker, or res compensation, or any graphical glitches whatsoever. So far I've done two lengthy sessions with zero problems. I got a slight hitch here and there on long drives, which happened in transition areas in between the many camps and random spawns, so I'm pretty sure it was just a matter of assets loading. This is pretty common with UE too.
Infinite does very much tie into previous games in the series story wise, so I highly recommend playing them in order if you want to get the most story immersion. As mentioned, the gameplay is very fun. The Grappleshot especially really changes the dynamic. It's great for moving around both in and out of combat, but also grabbing out of reach weapons or explosive containers, shock stunning enemies, and making punches do more damage when you grapple onto enemies.
That said, the game also has some quirks. One of the biggest being navigating land vehicles over the very rugged terrain. It takes close and careful observation of roads on the map first, and even then, a lot of roads end up dead ending, then you have to reassess how to get through. One of the strangest things is at times you'll rescue a captured squad, where there's a UNSC vehicle they all fit in, but there's no way to drive them out, so how did that vehicle get there?
It kinda reminds me of that awkward, ill conceived part of Far Cry 3 where there's a boat in a cave, with only a small stream going into it, yet somehow when you fix it, you can magically get it out of there. Another slight quirk, but this has only happened with ONE squad rescue so far, is when you get there and defeat all enemies, the squad is unresponsive, and the side mission doesn't register as complete. I had to drive out of there, come back, then an enemy ship came, and after we defeated them, the complete verification came. The squad would still not get in the vehicle though.
Despite any minor quirks though, yes, IMO the game is well worth getting. If you've not finished The Master Chief Collection though, you may want to do that first, then look for a sale on Infinite. Despite not having completed Reach on Heroic, I've already finished it on lower difficulties. So I had the full backlog of story events in my memory before getting Infinite, or at least as best as an old fart like me can retain such memories. LOL