I'm on a 7-loss streak even though I've MVPd the team on most of them.
For those paying attention, you'll notice that the above statement has a 00.16% chance of occurring on any given 7-loss streak by dumb luck; yet this is actually exceedingly common of my losses. It's not like I think I did the best but my team didn't back me up, so I failed; my end-of-game numbers are objectively better, and consistently. My interpretation is that my general mode of playing is intentionally obscure and unpredictable to keep the enemy off-balance, but it backfires because my team also has no idea what I'm going to do, so they behave in ways that incorrectly predict my behavior and then rage at me when I don't meet their expectations. In a way I'm responsible for this team failure, but I don't know how to fix it without becoming more predictable to the enemy.
Another possible factor is that I generally refuse to surrender while the odds of winning are better than about 5%, while most people seem to give up around 15-20%. All this extra play time in losing games has made me exceptionally good at playing underdog games, so in those games where we end up losing, my stats are usually improving while those of my allies, who only know how to snowball an early advantage, are getting worse. This is definitely a factor but probably not as big of one since I tend to MVP at least double my share of times on winning games as well.
So basically I'm awesome at the game and if there were 5 of me we'd be awesome, but my rating is being held back because I don't know how to stymie the enemy's plans without also stymieing those of my allies. This problem goes away with regular AT partners who know how I play, like Mr. Cookie, but most of my games are solo, so this is a serious issue.