Yes it is fun to do

. Here's a list I compiled of the possibility of clearing co-op chambers alone (that I know of at least):
Numbers before chamber name mean Course and Chamber, e.g. 2-3 means Course 2 Chamber 3.
1-1 mp_coop_doors: impossible
1-2 mp_coop_race_2: possible (bhop in part 1)
1-3 mp_coop_laser_2: part 1 impossible, part 2 possible
1-4 mp_coop_rat_maze: impossible
1-5 mp_coop_laser_crusher: possible
1-6 mp_coop_teambts: possible
2-1 mp_coop_fling_3: part 1 possible, part 2 impossible
2-2 mp_coop_infinifling_train: impossible
2-3 mp_coop_come_along: impossible
2-4 mp_coop_fling_1: possible (reportal)
2-5 mp_coop_catapult_1: possible
2-6 mp_coop_multifling_1: part 1 possible, part 2 impossible
2-7 mp_coop_fling_crushers: possible
2-8 mp_coop_fan: possible
3-1 mp_coop_wall_intro: possible
3-2 mp_coop_wall_2: possible
3-3 mp_coop_catapult_wall_intro: possible
3-4 mp_coop_wall_block: possible
3-5 mp_coop_catapult_2: possible
3-6 mp_coop_turret_walls: possible
3-7 mp_coop_turret_ball: possible
3-8 mp_coop_wall_5: possible
4-1 mp_coop_tbeam_redirect: possible
4-2 mp_coop_tbeam_drill: possible (bhop)
4-3 mp_coop_tbeam_catch_grind_1: possible
4-4 mp_coop_tbeam_laser_1: possible
4-5 mp_coop_tbeam_polarity: possible (bhop, might be possible without by cubeflinging)
4-6 mp_coop_tbeam_polarity2: possible (bhop)
4-7 mp_coop_tbeam_polarity3: impossible
4-8 mp_coop_tbeam_maze: possible
4-9 mp_coop_tbeam_end: possible
5-1 mp_coop_paint_come_along: impossible
5-2 mp_coop_paint_redirect: possible
5-3 mp_coop_paint_bridge: possible
5-4 mp_coop_paint_walljumps: possible
5-5 mp_coop_paint_speed_fling: possible
5-6 mp_coop_paint_red_racer: possible
5-7 mp_coop_paint_speed_catch: possible (requires you to go 'off' the map; clipping issues with the map allow you to go outside the normal map)
5-8 mp_coop_paint_longjump_intro: possible
Course 1: 3 possible, 1 partly, 2 impossible
Course 2: 4 possible, 2 partly, 2 impossible
Course 3: 8 possible, 0 partly, 0 impossible
Course 4: 8 possible, 0 partly, 1 impossible
Course 5: 7 possible, 0 partly, 1 impossible
30 completely possible Chambers, 6 of which need a glitch (4x bhop, 1x reportal, 1x map clip issues).
3 partly possible Chambers.
6 impossible Chambers.
Have fun!
