See, therin lies the problem, you haven't watched all the seasons. And you lose all commentary say, or any that has any value. For if you've actually been watching Psych, you'd see that the characters are developing. It's basically what the more serious undertones of season 3 have been about.
By your own standards you don't have any right to make any sort of comment on this show ripping something off. Just because two shows begin in a similar manner doesn't mean that they have to continue that way and you don't know what the writer's are going to do. I have never watched psych and probably never will, II_Seraphim_II has hit the core of why not for me. They do tend not to allow large plot arcs and good character development. I am looking forward to this seeing new episodes of this show, I would say that there is a bit of a "House" aspect to the show.