Spoilers ahead...
I thought the finale was kind of flat, to be honest. After all this back and forth all season, the finale kind of felt like a non-event. Killing off Meera didn't get us much of anything. She's barely existed as a character. If it would have been Ressler it would have had a bit more impact, since at least we've got to know him a bit. I wasn't seriously worried about Cooper at all.
As for Berlin, it's impossible to say how effective he'l be as a villain since we barely saw him. I can't say I found him terribly imposing in the one shot we got of him. Do we think the story about his daughter is true? Is it possible Red is the one responsible for such a reprehensible thing? Is that why he's got his sights set on Red?
We got perhaps our biggest clue yet that Red is Liz's father, with the final shot of his burns. I don't know how to feel about that. One one hand, it's seems so predictable. On the other hand, I'm not sure anything else would be that emotionally satisfying.
I've enjoyed The Blacklist overall, but I can't say that the finale really had me excited to watch another season, in the end, though I'm glad it's coming back. I would have liked more of a resolution, with a newer, fresher arc for season 2. Spader is great. But after watching a whole season, I definitely feel like they need to build a better show around him.
Either they need to just do away with all the extraneous characters by disbanding the task force and really focus on Red/Keen, who would then use more "freelance" resources, or they need to make it more of an ensemble with some more interesting characters. Right now, I feel like they are kind of playing the middle of the line and it's leaving me a little unsatisfied. Part of it is that the agents seem SO inept sometimes. They are always showing up too late, after someone's been killed. I understand some of that is necessary to make sure Red shines. But there's a point where they look so bungling you wonder how they have a job. It's especially bad when Liz herself seems a bit slow. There are time when she stares at a pile of papers and deduces something, but that doesn't feel all that earned.