Yay, Rein is the best among a role which feels like a torture to play in the past few months.
Lets not try to even argue that, its a fact and que time shows it, and im saying that as someone who usually have a tank mindset.
Best ult in the game? Nah, i would trade his ult in a heartbeat to plenty of other ults in the game atm (just to mention a few, Zen, Junkrat, Ashe, Sym). Now if he would got his old stun time back, now that would be an arguement.
Incredible Defensive and offensive? Where? I mean compared to the rest of the tanks sure. In any other context no, the majority of the time your shield is about half destroyed when you even get in your effective range to engage in combat yourself.
Sure you are deadly with Rein at close range, i would even say way too deadly, but the shield is just too weak to feel like you can do your job as a tank, and this is the keyword right there. Rein feels good to play as a melee DPS, not good as a tank.