As someone who stopped watching after the graduated from high school in season 3 and hadn't looked back (save for checking out a random episode of season 4 and cringing), I finally came back to McKinley for the finale and it was...ok?
I actually liked the "2009" episode. It was overall pointless and redundant, but in many ways it felt like Ryan Murphy was just nostalgic himself for when the show worked. The writing and characterizations were much sharper in "2009" than they were in the actual finale, and there was a clear handle on the story and characters (of course continuity gave them little wiggle room to not be aware of that stuff). But I still suspect Murphy never expected the show to turn into a pop culture phenomenon and that as it grew bigger, he lost interest. He only planned those first 12 episodes, and returning to what was his original inspiration gave the show a focus on its central original five characters (sadly minus Finn) and Mr. Schu, who was an actual character during the first 1.5 seasons.
Relying on "Don't Stop Believing" shows that they were trying to recapture the magic of those early days. Obviously, they couldn't really since they had to rely on the actual finale of the "Pilot" to end the episode, but it was nice to see a focus on the core cast that started it.
As for the final episode.....I actually liked Sue becoming Vice President? It was bizarre and made no sense as I assume she got fired when the school became an arts school but it was funny. Also, Will as principal and Sam as the new Glee Club coach made a whole lot of perfect finale sense to me. It's nice that they showed not everyone has to be a Broadway or pop music star to have a "happy ending," and it made a great deal of sense that Sam would follow in Will/Finn's footsteps (as this was obviously Finn's ending).
As for the Rachel, Kurt, Blaine stuff: I liked "Daydream Believer" just because it was the one song in the finale where they actually appeared to be having fun like the old days, Darren Criss' terrible wig not withstanding. But their endings overall just felt too sugary for my taste. Sue Sylvester is a cartoon character, so her as VP is ridiculous and fine. But Rachel winning a Tony, Kurt and Blaine also being equally successful Broadway and theatre stars, and Rachel agreeing to be their surrogate? Gag
With that said, I do like the choice of her ending up with Jesse instead of apparently Sam as Finn 2.0. Rachel is very much of New York not Lima. Sure, Jesse was a *****ebag in high school, but Rachel wasn't the nicest person in the world at first either. That made sense.
The only other thing I have to say is why did Quinn, Santana, and Brittany not get closure? I really haven't watched the last couple of seasons, was there something more for those three in there? Because honestly, I always enjoyed those characters more than a lot of Murphy's darlings, and it was weird that they were brought back to be back-up singers in the final song, but otherwise had no roles in the last two episodes.
Oh as for downloading, I downloaded a bunch of season 1 music (I am now somewhat sheepishly ashamed to admit) in 2009 and 2010. Some songs from Season 2. And I think I downloaded like one or two tracks only from Season 3. Kind of like the show and its sliding scale of quality.