Since it's been a while and maybe i'm biased though nostalgia, i dusted off my PS3, and fired up ME3MP last night... Oh My Deity(s) is it fun!
Went with Asari Vanguard (Harrier X crutch), joined wave 2, it was Rio (picked by host) Geth Gold, with two players in the box-o-shame, and myself and another running about outside
Yes i was going down like a hooker at stag party (sorry PUGs), it's been a while, but showed how important actual skill was: not ePeening, but i was literally able to solo gold with any character before, so i was kinda embarrassed.
Went well enough though, despite some cheap Geth stun-locking, and i think one of the box of shamers didn't make it to extraction (ePeen time, yes i topped score board, despite being rusty, other "outside" PUG got second).
Bailed out at the lobby, and soloed NovaGuard on bronze to i could practice Shockwave surfing
RAAGH! RAAAGGH! WUB-WUB-WUB BAWOOSH!
So overall compared to DAMP:
+ more intense moment-to-moment gameplay
+ higher skill requirement
+ less gear dependance
+ more player variety (weapon and character interactions)
+ enemy variety
+ level design, complexity and tactical interaction with players
- graphics
- Field of View
- loading times
- social stuff (no Sharing, YouTube uploads etc)
A lot is subjective, and down to what does one prefer? But the sheer variety in gameplay is significant compared to DAMP, where most games and characters play out the same. The main point in favour of DAMP is the generational change, but if a PS4 version of ME3MP came out (without single player at all), i'd be even more in favour of the latter.
So while the OP isn't incorrect in that an argument can be made, the statement is false (IMO obviously, as this is a subjective issue), and retrying each game has had the net effect of probably making me play less DAMP and more ME3MP.