Funny you bring this up because I should confess some things.
Back when I was a major Hellblazer virgin and knew nothing about the character, from first glance, I thought he was a generic, loner of a character who whines about life in a melodramatic way and smokes a lot. Before I read it, I found him to be the stereotypical Brit who says bloody and fuck all the time, wearing the stereotypical British trench coat, and complaining about the government on internet forums. My only exposure to John directly was through Keanu Reeves's Constantine movie, and while impressive, didn't attach me to him that well.
What introduced me to Hellblazer wasn't hellblazer itself (reasons as mentioned above) but instead Supernatural, and its character Castiel. I loved his attire, and the attitude he gave off in the series (well use to anyway. Now he's just a boring hollow shell of what he use to be) Doing research on the character, there was a mention that he was based off of John Constantine. SO I looked him up, and ended up reading the series. The first issue didn't really have me invested in him at all, and it only proved my initial feelings towards him being the stereotypical brit who says bloody and fuck a lot. The rest of the issues didn't fill me with any confidence either as I just felt like he wasn't anything special. It wasn't until the storylines Hold Me and Dangerous Habits that I quickly became enamored by him. Then after that, I started to like him a lot. But with the first few issues, it wasn't John that kept me reading, but rather what was happening around him. The conspiracy theories, the political commentary, and the creepy monsters. John himself however, didn't feel all that interesting until Dangerous Habits, where I actually cared about his well-being.
When I got to Azzerello's run, that's when I began to feel the same way I felt back in the beginning of Hellblazer, when he felt less intriguing, and the world and events around him became more worth reading about then John in general. Mike Carey, for the most part, brought back my liking to John, but that was immediately dissipated once Milligan came into the picture for obvious reasons.
Then Constantine and JLD appeared and...well you know.
Then he was in Injustice which was a nice iteration of him.
Of course I enjoyed Matt Ryan's performance as him as well.
Then Constantine: The Hellblazer arrived. For those who know me, knew I very much hated this version of John's physical appearance to death. I found the representation of his bisexuality to be better in this version, however the story, feel, character progression, and everything else about it couldn't follow. It didn't feel like a hellblazer story at all, and was more a parody of what Tumblr thinks is a Hellblazer story by playing it safe, and taking no risk.The art style seemed aright but I just didn't feel this was the right story for John to come back to. The sneak peek pulled me in, but after that, it fell flat on its face. The rest of the series was nothing like the sneak peak, and I think it was because that's all it was; a sneak peak.
I always felt John was better suited for short excerpts and not full on stories anymore, since everything that could be done with John has been done already, and now there's not much new ground to tread with him.
So imagine my suprise when we see John back in his usual attire, meeting Chas, going back to England, and bringing back the feelings of the Hellblazer of old. I was ecstatic. Yeah, it was treading old boundaries, but I didn't care. I was just glad we were getting back to the old days of the series, which was a hell of a lot welcome for me then what Constantine and C:THB was doing.