With the exception of a few things, almost everything gameplay wise is drastically different from SP to MP.
Did the weapon mechanics teams from SP & MP even communicate with each other? Because it sure doesn't appear that way?
With the way the games MP is presently balanced the only suit mods that are useful are Armor Enhance, Stealth Enhance and Mobility Enhance. The suit enhancement mods should've been split off into their own 4th mod category.
Allowing all three Enhancement Mods to be equipped simultaneously makes ALL the remaining mods pretty useless.
As for the weapon attachments, why is it the only attribute that changes for your weapon when an attachment is applied is it ONLY CHANGES THE MOBILITY RATING?!? W T F
Reflex sight should increase accuracy
Assault scope should increase range
Silencer should decrease range
The Gauss undermount doesn't work and is completely ineffective
L-Tag and JAW need to at least have the same amount of splash damage as grenades. Hell, the JAW doesn't even work against the Ceph Gunship!
The only attachment that's worth having is the Extended Mag
Right now the only mods I use are:
Armor Enhance
Stealth Enhance
Mobility Enhance
Extended Mag
In the games current state, I find all other loadouts to be absolutely useless.