The serial killer is something we've seen before in many places, including even Criminal Minds, about as different from Banshee as you can get. It was done much better on Dexter, in every one of its seasons. Unless some other suspect emerges in the finale, Rebecca deserved a more interesting killer.
And the neo-Nazis have been no great shakes as villains, either, on balance. Proctor, the Native Americans, just about every other antagonist has been more interesting and less trite. The only really exciting thing to happen with these white supremacists was the killing of the brutal father-in-law a few episodes ago.
Hood finally telling Brock who he really is was good to see, but even this lacked, I don't know, a certain dramatic tension. Carrie's story also has been good, but weaker than it's been in earlier seasons.
I guess the reason I've been so disappointed this season is because Banshee was so compelling and stunningly original in prior years. Even with this weak wrap-up, Banshee will go down as one of the most innovative and powerful shows ever on television.
And who knows, maybe the finale will surprise on Friday.
See also Banshee Season 4 Debut: Whunnit? ... Banshee 4.2: Carrie and Rebecca ... Banshee 4.3: Serial Killers and Theories ... Banshee 4.5: Alliances
And see also Banshee 3.1: Taking Stock ... Banshee 3.2: Women in Charge ...Banshee 3.3: Burton vs. Nola ... Banshee 3.4: Burton and Rebecca ... Banshee 3.5: Almost the Alamo ... Banshee 3.6: Perfect What-If Bookends ... Banshee 3.7: Movie with Movie ... Banshee 3.8: What Did Rebecca Find with Burton? ... Banshee 3.9: Loyalty ... Banshee Season 3 Finale: Subtractions and Additions