Is there anything more besides MMR and LP gains ?

Is just a flat matchmaking system ? I am thinking about scenarios like : Your team is losing hard but you are the only one with good stats like - dmg dealt/ taken (depends on the role), wards placed/killed, kill participation/kills/deaths , this should alarm the system - This player actually dont deserve to lose, he is the MVP of his team , lets cut 2 lp from the -13 lp loss so he loses -11 , also with MMR. Or ofc the opposite scenario - your team is winning but you are really afk half of the time, feeding and etc. - you should take a harder LP and MMR hit.

This sound pretty balanced in my opinion ? Is there something like that or those stats can misslead or are very hard to follow ?