Yeah, I did a few solo bronze matches with reapers. Honestly I didn't find it much fun, especially on the later waves since you have to do a lot of kiting to keep wear down the banshees.
Honestly gold isn't that hard so long as you have a well balanced and capable team...unless you're up against collectors in which case you're in for a fight!
It helps that I have some pretty good builds
. My Asari vanguard is a wrecking ball on legs.