I have watched the entire series of this and the only derogatory comment I have is that it finished too soon. I'm sure they could have created a few more episodes, maybe even another series or two. That aside though, I found it completely enthralling to watch. Dominic was a good choice for the character John Doe, he played the part admirably. And it seems it has helped him to progress onto other projects quite easily also.
The cases he involves himself with for the police department are normally quite bizarre and it is ingenious in the way he solves them. I especially enjoyed the little titbit's of trivia he comes out with and that it seems he will never have an incorrect answer for anyone.
I would recommend this series to anyone, except maybe the very young as it does hold some dark undertones sometimes.