As much as I loooooooved this show, I can't help but feel fear that the second season won't be up to snuff in comparison to the first, and we'll be looking at another cancellation.
I have that fear too but there's a huge saving grace that The Punisher as a character has over Luke Cage and Iron Fist and Jessica Jones. It's the same thing that keeps Daredevil relevant.
People that aren't comic book fans know who Punisher is. His story/backstory is one that basically any American can relate to because almost EVERYONE has a friend or family member that has served and probably been deployed in this day and age that came back... different... either physically or mentally.
Add to that that the skull is used by SEAL teams as their logos (Kyle/Jocko Willink's SEAL team used it) and his character is very ingrained in any even regular infantry unit he's well know. The problem Iron Fist especially had and Luke Cage have to a lesser degree is unless you're a comic book person... no one really knew who they were.
Daredevil and Punisher have enough crossover with the BIG TIME heroes like the Avengers (hell, Captain America almost killed Frank in Civil War), or Spider Man where he teams up with Daredevil and fought Frank when Frank was first introduced is a big deal.
Add in one last thing... it's obvious that Marvel knows they have a bit of a goldmine going with the Symbiotes with how Venom did... guess two other guys that Venom has taken over:
Venom or another Symbiote have taken over Daredevil and Punisher at one point or another too.
And last and final thing... the cast of Daredevil and the Punisher series... they can actually act.
Dude that plays Iron First is wooden as fuck and that whole cast generally is garbage outside of Wade which is a huge issue as Wade is barely a periphery character. Same with Luke Cage, the chick playing Mariah goes from either not seeming to give a shit in her scenes to over-acting to such a degree it looks like Shawn Michaels vs Hogan at Survivor Series. The cast of Jessica Jones isn't much better.
By comparison, Cox and Bernthal you can tell take their roles as Murdock and Castle not only seriously but they're also HUGE fans of the characters they're playing and you can feel that in their portrayals.
EDIT:
It's the same reason that even though there hasn't been a solo Hulk film since the Ed Norton on that an argument can be made and is right that Ruffalo is better as Banner. Compared to Norton's portrayal at least Ruffalo seems to be enjoying it and brings a lot to the screen as The Hulk and is believable. Roth and the dude playing the General in the Norton Hulk movie are the only two guys that seemed to give a shit.