Yeah, 3rd match of the day was a RDM that was using the MP/GCD/immune to CC stuff and he literally 1v5'd the entire team several times cause we couldn't CC him at all but he got to dump his entire kit in one GCD which silences, binds, healing reduction, and does a bucket load of damage.

EDIT: Also reporting in this game is overly complicated. So even if you want to report it takes a process.