Well, it's up to you if or if you're not going to watch this. I for myself have made the decision not to watch season 3 anymore.
Especially during the last weeks of the Olympics hiatus I spent a lot of time screencapping some of the former seasons episodes and realized how much Grimm has changed in season 3. Weak characters, slappy writing, everything has to be bold and/or absurd. The characters are only pale comic reliefs of themselves. Sadly I have to say this is especially for Juliette. I had high hopes for her in season 3 as member of the Gang now. And partly Juliette IS awesome - only to turn the next minute again into a pale shadow. Monroe and Rosalee are completely out of the line, Nick is way too self-confident ... I could tell a book about what's wrong in season 3. And especially after the last few weeks with concentrating on the former seasons I came to the conclussion that I simply have enough and cannot take more.
So, I'm not watching anymore - or better, I only screencap for TeamGiuntoli and the weekly picspam here. I'm continuing searching the news, and I'm still interested in the show itself and the cast and crew (well, I care more abolut the EPs, crew and guest- and second-casts, not the writers). So, nothing big will change for you here. Only, don't expect to have any canon material anymore, as I simply don't know and don't care. As I've said, IF Grimm will get a fourth season, I will definitely give it a try. But with the current writing-team my bet is on another NoGo for me.
So, enough rambling, here are some spoilers and hints for what you have to expect in the backhalf (beside, there will be a short break at the end of this month again, no new Grimm on March, 28th):
weddings, birth, carnival episode ... Credit to RoyalSasha at Twitter for finding this.