Your "invite a partner" options in dungeons is absolutely broken.

I'm going to also write up a ticket for this because it just makes no sense at all what just happened to me. 
This picture speaks for itself. I pretty much brought an A-team to own the mystic path, and I get paired with a dude that has an 80k PI with Colossus as his top champ. The guy did well, but didn't make it through the first dungeon. You just CANNOT progress through certain things in the game without specific champs. GIVE ME A BREAK!
Now I have to wait until next week to use this team on the mystic path again.
DON'T TRY THE OPTION TO RANDOMLY FIND A PARTNER!

This picture speaks for itself. I pretty much brought an A-team to own the mystic path, and I get paired with a dude that has an 80k PI with Colossus as his top champ. The guy did well, but didn't make it through the first dungeon. You just CANNOT progress through certain things in the game without specific champs. GIVE ME A BREAK!
Now I have to wait until next week to use this team on the mystic path again.
DON'T TRY THE OPTION TO RANDOMLY FIND A PARTNER!
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Comments
Anecdotal evidence is great and all but we can at least provide evidence that it doesn't always work as intended. Op got a bigger screw job than me though.
The real downer is you can't see what team the other person has selected so you can't decide which path each will take and take the appropriate teams.
I feel Dungeon match making is only really worth it if you are desperate for some points. otherwise, it will most likely cause you to loose out on points and waste a good team of champs.
As you can see, here is a reason NOT to use the random find a partner when using your top champs
Normally the matched partner gets dead by room 6 or 7 but what annoys me most is people ignoring node kill requests or taking a lane without discussion first.
The matchmaking system is there to top up points when you can't find a reliable friend. It works well in that regard but I don't rely on it for the majority of the work.
I learned quickly that bringing a top team and hoping someone else does the same and doesn't suck is probably going to end in fail even at my end of the pool.