Right now unless people come together in this thread, there is no point in pursuing Gold level challenges unless they have their own sets of friends to play. At least on the PSN side. The 360 thread has more Gold talk and play.
I've added the people I've beaten gold with so if you want to party up and play with us you're more then welcome to. We're usually one short anyways. Never beat it Vs Reaper or Geth yet. Only Vs Cerb a couple times.
Best thing to do is stick together in groups of two,all 4 on 1 side of that map so no enemies can spawn or get behind you guys. Gold matches usually take about 40 mins so I'm not too sure you'd be willing to play that long.