The pithy comments about office life that makes Dilbert work so well as a comic strip doesn't work as well in a TV show. While there are times when you laugh hysterically at a particular quip, a laugh here and there doesn't sustain you through a whole episode. Many episodes felt as if they had little momentum on their own, which left you waiting between jokes.
The characters start out very one dimensional and remain the same throughout the series. As such we are left with stereotypes and clichés that gets a little boring. The producers could have used the TV genera to explore these characters and add some depth, especially Dilbert himself.
The episode quality appears to get better towards the end due to better story telling because episodes have a better overall theme to them. Albeit the show defiantly too a turn towards the outrageous,but animation thrives on this sort of absurdity.
Overall Dilbert is an enjoyable show with moments of brilliance, unfortunately there is a lot of filler that one must wade through to get to the good bits.