Would you be kind enough to share your thoughts on Sigma?
Watching some of the main OW channels on YT, Winston appears to be getting some love on attack to deal with the dual shield meta of Rein/Orisa with Sigma.
Also watched the Dragons vs Spitfire match over the weekend... nail biter! Looks like Doom is a must pick at that level, and PharMercy getting a lot of love from both teams.
I think the main thing I have learned with sigma is don't play him like an Orisa and don't expect your team mates to play him like an Orisa. He is not a tank where your team can line up behind the shield and just spam the other team. His shield dies in few seconds and once broken it is hard to get back again.
On defense I think he is best paired with another shield (rein/orisa).
On attack I think he is best paired some sort of dive and just push hard and fast.
I think his shield is best used aggressively to shut enemy players out the game, Example stick it in front of their ana so she can't heal, or stick it front of their widow/phara so they can't shoot. Or used aggressively to back up your dps, like if reaper goes in deep you chuck him the shield on point so he has something to work with.
Or defensively give your widow/mcree their own personal shield up high so they are free just to go wild without fear of getting shot back.
1500 health shield just isn't enough to stick down in front of 6 enemy team, it just instantly dies.