I'm sad that ARROW is ending, but it makes sense on every level. I could have seen ARROW going on and on like SUPERNATURAL, but ARROW seeded a whole family of shows with THE FLASH, SUPERGIRL, LEGENDS, BLACK LIGHTNING and BATWOMAN. SUPERNATURAL will likely cease to be a going concern once Jared and Jensen retire as neither BLOODLINES nor WAYWARD SISTERS went to series; the Arrowverse doesn't need ARROW to keep going.
Season 1 of ARROW was a masterpiece of unintentional comedy, trying to do a grim and gritty Christopher Nolan movie on a SMALLVILLE budget. Season 2 found its feet as an operatic, larger than life fantasy with Felicity's regular role lending some much-needed self-awareness. Season 3 started strong until it stumbled into the nonsensical mythology of death cults and magic resurrections and what-not.
Season 4 was even more nonsensically magical with demons and telekinetics and voodoo rituals and Stephen Amell was appalled, declaring that if Season 5 didn't return to ARROW as a street-crime series, there shouldn't be an ARROW series at all. Season 5 was almost universally acclaimed as a return to form; Seasons 6 - 7 have retained that back-to-basics template and some people like it and some don't.
Stephen Amell confessed in his podcast with Michael Rosenbaum that he was tired and that it would be up to him if ARROW were to have an eighth season and he would make that decision with thought and care.
I'm glad ARROW will get a good finale. I'm glad that Stephen Amell, having launched the DC television universe, can get some well-earned rest and maybe drink beer and eat chips again. I'm grateful that ARROW introduced us all to our friends Barry and Kara and Caitlin and Iris and Cisco and Alex and Jefferson and Jennifer and Sara and Ray and Nate and Eva.