I finished watching this a few days ago. I thought Punisher was great also. Particularly how he kept pulling the rug out from underneath other characters and the audience.
Some moments of the season were amazing, some were pretty lackluster. I thought the ending of the season, in particular, was a bit of a let-down. Though there were so many "major" events happening that maybe that was inevitable. Punisher's farewell appearance with his painted skull suit came out of nowhere, was unnecessary, and distracted from the overall narrative. I get they wanted to show him again, but it wasn't natural. The "death" of Elektra felt kind of weak. I was disappointed it wasn't Bullseye. And after all the angst regarding the sanctity of life, DD attempts to kill Nobu at the end, and as far as he knows at the time, does. I hope they explore that a bit more in season 3, as well as his discussion with Punisher earlier where DD seems to concede that killing is sometimes necessary?