I somehow managed to watch season four in just four days.
It's easy to see all the foreshadowing of Dawn in the season and cheese. Joss must really like the stuff because it's mentioned a few times and then of course there is the cheese man. Was that every explained by anybody? I enjoyed the season but found that towards the end, I was ready for the story to end. It's not that I didn't like Riley. I did actually. He was a decent character. There were some really not so great episodes in the season.
It's hard to believe the show started ten years ago. It doesn't feel like it's been that long. I still miss it. At least I have three more seasons to watch. That will be fun. I enjoyed the whole show and am glad for episodes on DVD.