Sorry for the super late reply. Things happened
For me I loved playing CoD 4 and Black Ops in their prime, so I was drawn to the gun-on-gun action, boots-on-ground, and the WW1 aesthetic. However if you have friends who can hop on with you, it's so much better than depending on randoms of varying skill to achieve the objective together.
As a result I can only take playing solo for so long until I log off... and come back on again
Take it with a grain of salt. I haven't played an FPS regularly since Black Ops 2 and I recently came back with MWR on console, before transitioning to PC.
Should you decide to shell out the moolah, you could play some music you like in the background or amongst the game sound to lessen the intensity