Ditto on both of these. I thought Agent Venom sounded unbelievable dumb and combined two characters I never cared much about on their own. And yet Agent Venom became one of my favorite characters and his solo one of my favorite runs.
And Kate never thrilled me all that much (didn't hate her, just wasn't a big fan) but yet her new solo is one of the best books out there and has made me fall in love with her.