If you think having gold elims means that the problem is your teammates, then you probably don't understand what is going on. There are a lot of things that contribute to a loss, but the most common ones are bad comps (duh), bad ult management, and trickling in; medals don't really tell you much because a single pick or someone going out of position could give a way the match.
If you have gold medals, you might be doing your own solo thing without proper team fighting. Kill participation is a better stat to look it, since if you are good at cleaning up and team fighting, you will have high kill participation.
If something isn't working, you don't look at your medals and blame the team. Look at the killfeed and comp. It might be bad ult management, bad comp or someone overextending. You might even be splitting up or not doing a certain job like peeling or creating space, or even pressuring with Soldier (one of the heroes who can easily boost his stats and medals).
There are obvious cases where you might have gold elims/damage which your DPS should have; it could be two things: DPS dying/messing up, or tanks not taking aggro/supports dying too early or not doing their jobs.
You don't analyze a match by medals and go on to blame your team. I've seen many people get all the eliminations and PoTGs when they chase kills and go 1vs3 or something; they don't give their team the opportunity to go in because they are basically doing team deathmatch.