I'm delighted for Lewis - he thoroughly deserves the championship. Nico was impressive, and at times I thought that he had the measure of Lewis - he certainly seems to be cooler and calmer than Lewis much of the time. Lewis tries his best to stay cool/calm when things don't go his way, but it's not too hard to tell when he's putting on a front. Also, Lewis made more mistakes at crucial moments this season. And yet, when it came down to a straight race, Lewis beat Nico hands-down, and that for me is what counts far more than anything else... Nico is a great driver - Lewis is a champion racer.
As for the rest of the teams, I'm glad to see Williams do so well - I'm not a huge fan of Massa, but both he and Bottas were impressive at times, although there's still alot of room for improvement... I can see Bottas getting better, but I fear that Massa is at his limit, or even quite far past his best. Ricciardo was brilliant this season, and I would be happy to see Red Bull produce a car that gave him a shot at the title next year... Kyvat could also produce the goods for RBR, but my money is on Ricciardo. With the possible exception of Force India, the midfield were well below what was expected of them. For me, Kimi Raikkonen was by far the most disappointing driver of the year... there's simply no excuse for finishing with ~1/3 of your team-mates points, and at times it was easy to forget he was even there. Sauber also need to take a good long look at themselves... really disappointing for them to finish without a single point, but maybe their new driver line-up will shake things up a bit. Lotus also need to do better, and getting rid of one or both of their drivers would be good to see, although I believe that both of them are at least trying.
Next season/the future? I certainly hope Alonso is not secretly holding out for a drive with Mercedes in 2016, as he's going to have a LONG wait. Merc would be insane to let Lewis walk, and they should be bending over backwards to keep him. Similarly, if it were a choice between Rosberg or Alonso, I'd normally take Alonso - BUT, with Lewis in the other car, it has to be Rosberg all the way... As for McLaren, I certainly hope they keep Jenson but somehow I doubt they will - it seems crazy that Kimi can hold on to his seat when Button could be without a drive for 2015... it also seems unwise to hire Alonso if they suspect that he actually wants to be somewhere else, but what do I know?