Most people probably dislike the show because they were expected, basically a Criminal Minds, from this point shortened to CM, clone, and no, that is not what you are getting or should expect.
The show have after 3 episodes done a bad job at making you bond with the characters, it's almost like they expected you to have seen the episodes of CM where these people appeared, and then assumes that they don't have to give you a better insight.
In difference from CM, these people don't seem to make much of a profile, they seem more obsessed with finding small hints, that other have overseen. Only the main character seems to have some insight in the minds of the criminals, since he try to place himself in their shoes, and understand why they did what they did.
However it isn't all bad, the criminals are somewhat interesting, as well as their crimes, and there seem to be a element in the series that have been poking my mind, but I have yet to put the finger on, which might make it better with time as one get used to that element (assuming it exists, and my mind aren't tricking me). Currently this seems to be all it is living on, but I am willing to give it the benefit of the doubt(for now), but it really do help to not think of it as an attempt to clone CM, and stop comparing it to CM.
Will not recommend it, at least not in it's current form.