I just finished up all the main and side missions the other day. Still had a bunch of uncollected blueprints and only made it through about 1/3 of the battle pass, but I'm done. Total playtime was around 90 hours, 100% solo.
It's basically Division crossed with Metal Gear Solid 5. I liked the gameplay in both of those, therefore I liked Breakpoint. It's that fun loop of infiltrating outposts, sneaking around and headshotting everybody, while being showered with loot that makes your numbers go up. Being able to freely jump around between the 4 classes adds much needed variety, although once you've cleared all the class challenges and filled out the skill tree in general, that feeling of progression hits a wall.
The main gripe I had in the end was that the in-game economy is extremely unbalanced. You're constantly running out of metal and grey, green, and blue weapon parts for the mark weapon upgrade system, yet you'll have literally hundreds of excess purple parts doing nothing for you (you could sell them, but the game makes it extremely difficult to do so since there is no way to sell multiples, you have to manually hold the button and wait for each single item to process).
Consequently, 80% of my shop expenditures were nothing but buying junk weapons just to immediately break down into parts. This meant that even after playing 90 hours, the only major purchase I was able to make was a rocket helicopter at the 80 hour mark. This also meant that I was rarely able to craft anything useful (e.g. mines), since many items inexplicably draw on the same metal resource pool that you need for upgrading your weapons.