Bad performance, stuttering with GTX 2080 TI I9 9900K, arguably the most common high performance system out there.
Guns are not fun to use, attachments look goofy and weird because its the Vietnam era and they tried to match the amount of attachments for MW.
Maps aren't good or fun either.
Anyway, that's my experience. I wish I didn't pre-order it. I would definitely get a refund if I could because I'm never playing this again.