Shhhh! Can’t you keep a secret? 
As an alternative to HP gear, you can also put a shield on him. You trade off initial burst for a longer time at max HP, so it’s a wash late round, but crazy good early round, especially with a Reyna around.
I believe Boldur is one of the strongest characters in the game… with the shield guard cancel, and it’s wavedash-esque effect of partial damage absorption. I’m hoping it’s intended, like Benedict’s reload weave, because I can’t imagine playing him without it.
Without it, I’d say he’s mid-tier, mostly because he loses his ability to handle minions in the early round. His melee chain is way too slow to be effective, even with gear. Quick melee isn’t too bad, especially since the diminishing knockback fix lets you more efficiently body block, but then there’s that ugly delay that keeps you from raising your shield until after the animation finishes…
Players avoid playing him, so they don’t understand his mechanics. I’ve seen even long-time players unload entire magazines into a shield with runes, healing me to full HP. They avoid playing him because he’s complicated, and requires patience and technical skill. Why bother, when you can Ghalt Hook a bunch of easy, laggy kills, or play every-CC-multi-tool tank with Galilea?
He’s also pretty terrible in PvE, so it’s not like you can practice there. 
