Punisher is my favorite comic book character second only to Spiderman, and Bernthal is personally my favorite take on him. They altered the origin a bit and Castle hasn't descended totally into the force of nature Frank inevitably becomes but he's nailed the performance. Despite being the smallest physically to step into the role, he had the most prescense after donning the skull.
Dude's voice and his mannerisms as Castle are exactly how I'd envision it in real life. He's an unremorseful machine. You can feel his anger at times through the screen and that cemetery scene with Daredevil describing his baby girls death was more powerful and memomarble than anything they ever put on the big screen concerning The Punisher.
If the rumors and speculation is true and they're doing the Slavers arc for season 2, it won't even be up for debate.