For some, apparently, Tulloch's character has been unpleasant or 'lightweight', and having no 'chemistry' with Nick.
I, however, find the entire series, and all the main characters, delightful.
As for one reviewer's estimation that the 'weak' Julliette character was gotten rid off in the end of Season 4, one of the episodes at and, or, near, the end of Season 4 clearly indicates otherwise:
Julliette had had a certain secret going's-on with 'Trouble' regarding Juliette's Hexenbiest issue. 'Trouble' had briefly been on the phone with Juliette, while 'Trouble' was in the passenger seat in some vehicle that I think was being driven by either Nick or Budd. This was prior to Juliette's going to kill Nick. Something was going on behind the scene for which Juliette needed 'Trouble''s help, but about which neither 'Trouble' not Juliette could tell Nick.
So I knew that the Juliette character was not being gotten rid of in the series moving forward.
So when I saw her getting killed at the end of Season 4, I knew she was not going to remain inactive in the series, but would soon enough come back in some manner.
So the reviewers here who thought that the series was getting rid of the Juliette character had failed to noticed much of what the writers, actors, directors, and etc., have been putting into this show from the very start.
This is not a show all about the action, or about the action plus some loner Grimm.
Rather, this show is as *a complex mystery drama-romance* as much as it is a police-procedural-with-a-fantastic-twist. From the very first (pilot) episode, this was established (when Nick's aunt Marie told Nick that he had to stop seeing Juliette because the life of a Grimm was "just too dangerous"), and has been reinforced ever since then.
More to the point, the very first scene with Nick, in the pilot, was reinforcing this entire complex. In that scene, we are given the basic premise for the entire show: (1) Nick is thinking of Juliette; (2) and he cannot look longingly at any other woman; (3) but then he for some reason is wondering something about Adalind Shade, and briefly watches her; (4) only to see her Hexenbiest nature-form show through; (5) We later learn that Grimms can see Vessen when Vessen are under some distress, yet Adalind in that first scene did not look distressed. (7) But as the first episode, and then the second, progresses, we learn that Adalind was after the key, and that that effort was no easy or simple matter.
...And, don't you know, Tulloch's character is named Juliette. Whether this name was on purpose or not, it sure fits the Romeo whom Nick is. Guintoli, who plays Nick, is half Italian (and half Polish-German, which fits the Grimm character as German). And even if Guintoli was not Italian, we see the Nick character often eating Italian at home, and that his favorite dish is some Italian dish.
There is so much that could be said about this show. Therefore, most anyone who cannot help but notice this show's actual details will find the show to be far more than some run-of-the-mill action-police-procedural-fantasy.
So, to be so concerned for this show's 'faults' is to miss most of what this show is about, and thus miss many of its ever-developing central points.
In sum: If this show fails to entertain, this is *not* the fault of the show. Rather, such a 'failure' merely is the consequence of the particular set of sensibilities *and insensibilities* on the part of those viewers who find the show less-than-worthwhile. Some people don't like tomatoes. Go figure.
I wrote the above review months ago. As I write these words, here and below, it currently is Monday, May 23, 2016, and I have just finished watching the final episode of Season 5 (Ep. 22, 'part 2' of the 2-ep 'Beginning of the End').
I could not have expected a better ending to season 5. It was perfect. I hope all goes well for everyone on the show, and I hope very much to see a Season 6. As I had hoped, Tulloch's character (Juliet) has returned! Now I get to find out (in a hoped-for Season 6) how Juliet's character is developed from here! Who is/was Eve, and why did Misner open a cell door and say to Trouble sitting there, 'It's time." ? Why was Trouble in a cell there, only to end up on a motorbike at Nick's secret loft? And who was Misner earlier than that violently doing something with in a cell, for which of which he came out with a bloodied lip? In the ending episodes of Season 4 (4), why did Trouble take a phone call from Hexen-Juliet and pretend to Bud that it was a routine all from Nick? What did Juliet want with Trouble for that phone call?
And, now,... at the end of Season 5 !, ...what has Juliet been through, and why did Trouble set her there and bid Monroe and Rosalie to continue on through the tunnel? Trouble said that this was a defense in case Black Claw came down after them.
But I think Trouble knows more than she is telling. Much more. As she had said something to that effect to Nick when he took her to the hospital. But then Black Claw agents who were her nurse and doctor were going to do something to Trouble when they told her they had to operate on her brain ! LOL. Misner and Nick came and rescued her.
...and now, at the end of Season 5, Trouble is there in the secret tunnel, sitting next to Juliet, and Juliet says to her...
A perfect ending to Season 5 !!!! !!!!