I got a mid 2000 placement, then tanked pretty hard (2200). From there I stayed at or around 2500 until recently where a good run pushed me to over 2800. In the end it was too much to get the diamond. I'd say I was a strong Plat level, looking to scrape into the diamond bracket.
Started off Playing Hanzo, and still enjoy using him when playing against certain characters. Bastion again useful for unexpected gameplay and upsetting the enemy. But its my soldier 76 that has come one leaps and bounds where I consistently get good stats for him. I'll be focusing more on Ana next giving me options, but I'm not going to spread myself too thin, being good at 4 characters is better than being average at 8.
The key for general improvement now is tactics and structure. We're all guilty of running off and not complimenting our team mates skills. Having one person in overall control helps, and they can call out a request for focus fire. If a mercy is stopping us, then lets destroy her. I think we need a more regular Zenyatta, he is so useful for neutralising Pharah.