I didn't know there were more than 2 seasons. I did quite like the show, and the dynamic between Dave and Cody. How many seasons are there?
3 so far to my knowledge with a forth in the works. Dave is only in the first two. The third is still pretty decent, but not nearly as good as 1 and 2. Joe does a fine job but he's just not as interesting as Dave was.
Dave and Cody had television chemistry that very few television partnerships have. It was a mistake to let go of Dave and it is a mistake to let go of Cody. Those two people where what made the show stand out as unique and interesting; and now they've both been given the boot.
Joe is perfectly qualified for the job and I'm sure his new partner will be as well. But I highly doubt they will be nearly as interesting. We watch the show to be entertained after all.