Prime Target

The basic idea is great: the notion that a gov't might kill to keep a possible math shortcut, that would instantly render useless modern cryptography, from being discovered isn't totally ridiculous.

Though I'm sufficiently interested to finish the series, what sank this for me, as already mentioned by others, are things such as the "check-list" attributes assigned to characters and thus the selected actors. Consequently, I found the casting was hit and miss. That may have also been a result of the direction. E.g. In episode 5, particularly, one veteran actor may well have been given direction to "imagine Matthew Goode in the role and act like him".

And the script wasn't great.

6/10 means interesting enough to watch it through but prioritize other, much better, viewing options.