I don’t mean to suggest that your observations aren’t a valid concern, I’ve also experienced connectivity issues after switching ISPs, and I’ve felt some frustration. I’m not the right person to give a definitive answer. However, my limited understanding of the topic leads me to think that moving from a P2P system to a server-based one is not as trivial as it might seem. I hope I'm wrong  about this 

For ELO to work near to correctly, you need matchmaking system.  Otherwise, as guerringuerrin said, this is small community - you will find out your relative skill level by playing with others. Btw, i'd not use ELO numbers, rather Tier 1, Tier 2, Tier 3, etc. Or Level 1,2,3....

P.S. i wanted to try new release and play Rated to update my MMR a bit, but this really bothered me I kinda lost will to find hack to play. Also lag/performance... Really essential things imo.

what's cost? How OpenRA has tens of servers (they don't do peer-to-peer but every game goes via server afaik)? I mean we don't have thousands of players, these days processing power shouldn't be expensive, is it? And isn't this main priority? If guys already invested thousands of hours in developing this great game, shouldn't it be finished to work properly? God knows how many players are annoyed by this... I mean, IK it's open source but...  there must be a way

My 2 cents: Ratings is not that accurate as it seems until you get 2000 with 1000+ games