I love Episode 3 man. It feels so much bigger that 1&2. The part where you fight all the waves of incoming bashees, wraiths, and phantoms in the Mantis? Awesome! I had to do it on easy or normal because my wife was playing with me, but I'm looking forward to doing it on legendary. Somehow it felt grander in scope than the similar fight in the campaign toward the end. Not to mention episode 3's LONG cinematic. Freaking fantastic. I also like how they incorporated multiplayer maps into Spartan Ops. I didn't like it in Reach for multiplayer, but tying S.ops into familiar grounds somehow feels better than putting the MP on campaign areas (or designing them for use in both as it were). Can't wait for Ep 4&5!
Landed on exactly 500,000/500,000gs with exactly 18500 achievements and exactly 500 games. All 100% including DLC. Was going hard the first half of January to reach that goal! Finished it on 1-19-2016. Final achievement: Completion Serenity in Nero.