I think getting Gold is a fair measure of how well you're doing in 90% of situations. Especially if you are getting more than 1 in a match. Maybe barring Elims as you could be getting assists.
But I'm not sure what the "Why?" was about. I wasn't taking anything seriously. Just messing around, and when people complained about Bastion I complained about the Bastion on my team as well. I kept the fact that I had Golds to myself.
Oh, well, as long a you were in Quick Play. I figured this was in competitive. Running joke heroes/comps in competitive is pretty crap.
Getting golds can be a decent measure of the stats they track -- your eliminations, damage, healing, objective kills, etc, but if you're just racking up any of those stats without actually contributing to the team pushing objectives then it doesn't matter. Overwatch is not like a MOBA where racking up kills makes your team more powerful/more likely to win, kills are disposable if they are not leading up to capturing the objective.
Basically, lots of times people go on to treat the game as a Team Deathmatch and forget to actually focus on the objectives, where it matters. If you're picking off random Tracers the whole game while your team is getting demolished on the point in KOTH, you might have gold elims and damage because without you they are getting steamrolled and can't get any shots in or anything done. You might be pocket healing a Pharah who isn't actually doing anything and get gold healing, or you might just be the only healer and get gold heals by default. I guess Objective Kills is one of the most "important" golds, but it could just be you're contributing to a crap comp and just happen to have the most objective kills to no real end (e.g. 5 objective kills because nobody else can really get anything done).
It's all really subjective. People like touting golds..but they only really matter if your team is winning the game/working together in a way that makes sense. This isn't really directed at you, just kind of a rant in general.