The matchmaking system will take your lower-skilled friend into consideration when finding a match. Your CS:GO profile rank is displayed above your competitive skill group and increases through match XP. Match XP is earned in both casual and competitive matchmaking and is earned after the match has concluded.

Is MGE good rank?

MGE means that you are starting to control your ak, your invidual or team work skills are not that bad. Everyone on HLTV acts like theyre a Global, but yes MGE is actually a decent rank. Its in the top ~20% of the playerbase according to csgo-stats.com/ranks.