I never thought Clint Barton was bland or boring - just underused. I thought Kate would end up being the one to carry "Hawkeye". But I was happily surprised to see that the series did Clint justice. And both Jeremy Renner and Hailee Steinfeld had great chemistry.
I thought many heroes were underused but they still managed to have a bit of personality but not Clint
And Clint just randomly shows up. Nothing about his progression seems incremental. It's not like Tony or Thor
Plus I don't get the whole relatability issue. Not having powers doesn't make one more relatable. Imo it's about having realistic emotions and relationships. Thor does than way better than Hawkeye or Black Widow, for example, despite being powerful