O'Hurley seemed too bombastic somehow. Karn was okay but just a little too "vanilla" as far as blandness goes.
I think Feud is a very tired game now, having been on for 15 seasons in its current run, with 4 different hosts (Anderson, Karn, O'Hurley & Harvey), and from California to Florida to Georgia, I don't even know where it tapes anymore.
I will, on occasion, watch a Harvey Feud episode. I sometimes enjoy watching his facial expressions when an answer is given, but overall I've not been a big fan of Feud since the show let go of Ray Combs. The ABC version with Richard, and the CBS version with Combs, and their primetime versions were the real Feud to me. Now it's just too antiseptic looking, and much too modernized. I always loved the homespun feel of the Feud sets when they had the cross stitch looking patterns, and the flippy tote board for the main game, eggcrate readouts, etc.