Watchable but falls down here and there. For example: whenever the gendams go to interview the supposed mad genius criminal they just shout at him demanding that he "must tell them"... I mean for heavens sake, it's completely out of character for an allegedly experienced and accomplished officer of the law to take that approach.
Also the compete lack of security protocols in episode 4 is laughable. I'm sure we can all allow a little artistic licence to help a plot move along, but blatent bodges and fudges are just an insult to the contemporary viewer.