Is everyone just flying one MC-80 and no other ships? I flew a double MC-80 and AFII list and rolled in a tournament. Not losing a ship and scoring 28/30 points and no not every game was perfectly set up for me. Plus you don't want an MC-80 to be fast, it's not an ISD where you want to get in and get close, you want to stay away. By turn three you should have stripped shields and possibly landed at least one hit. MC-80's have a purpose in the game just like every other ship. It is meant to hit hard, to put it in a list that doesn't have a build around it's strengths it will struggle just as an ISD would in a list that doesn't help it's strengths.
An MC-80 with XI-7's will put a hurting on just about anything other than maybe a Raider and Neb, but as long as you don't roll awful, Raiders should be popped in one shot assuming you get A focus to target the brace.
Finally, if you bring Ackbar and pair the MC-80 with an AF or another MC-80 you don't need a concentrate fire every time, which means you can spam engineering and drop a 6 engineering value on one turn and completely change the game.
Say what you will, but the MC-80 is by far not Terribad. It has by far outplayed my ISD's and outlasted them in multiple games.