I definitely agree. I played a ton of him so far and hitting his grab attack is just too easy. That charge that heals for 2 bars is something I very very rarely missed and takes little effort from me. I'm all for winning, but it is the only move I've come across where the risk/reward is pretty hard to justify. Sure you might lose health if you miss, but missing is incredibly rare since I only used it when they are stunned or distracted.
Is he? I never really had a problem killing a Shogoki yet. Nobushi on the other hand seems insane. Way too much range and damage while having the best disengage in the game. Not to mention that a Nobushi that fills up rage from fighting outnumbered can two shot you and becomes tanky and agile as hell. Only way I've been able to beat a good one is on Valkyrie because of how good they are at diving on people who are trying to run.
The Heavy Samurai is just fine imo. If he gets nerfed now, he'll just get buffed later. He is very limited in terms of his move set so anyone complaining already about how strong he is, simply lacks time and knowledge on how to play around this slow, hard hitting, rock paper scissor fat fellow.. When it comes to speed, he's the last one to get to the battle field in Dominion.