(Get the pitchforks and torches, boys, this guy's askin' to be lynched!)
I HATE this bloody movie. The Trek films have been a roller coaster ride, some good, some bad, a couple excellent and a couple that suck like black hole powered super Hoovers! And I have to put TVH in the last listed category. I've never understood its popularity.
Sloppy writing, slipshod direction, poor SFX, student level cinematography and perhaps the worst performance by a guest star in Star Trek's history combine to make this one the most cringe worthy of them all. Its an insult to the intelligence of the casual viewer, much less the dedicated Star Trek fan. I think the idea for the story came to Nimoy after one too many martini's and a screening of Fern Gully!
So what motivates the probe's attack on Earth? Maybe it read the bloody script and decided that any species capable of such tripe should be well steamed and served up with a nice lemon butter sauce....

Well, Ensign your not shy with your opinions are you.
Lets take a look shall we, this was the 4th film of many to come. The 1st (TMP) was not a critical success but made a lot of $$, the 2nd (TWK) had the
best of both worlds praise by critics & fans a like and lots of income. The 3rd (TS4S) was deemed eventually as a 'moderate' success that came under budget. And then their is the 4th (TVH), which was destined to become the most successful film of the franchise up to that time, and indeed went "mainstream".
It was a 'good-feel' movie, the general public loved it, their was enough nods to character growth & continuity that the fan-base (at that time) loved it. It was a win-win.
Sloppy writing-I see no strong evidence of this, the writers (Meyer, Bennett, Kirks & Nimoy) told an adventurous fish-out-of-water story with an ecological angle.
Slipshod direction-that criticism is a mystery: the crew return home, learn of the crisis, travel to solve crisis, build allies where need and save the "day". The direction seems clear to me. Of course they could of had a direct Court Marshall film as was once intended, maybe with Denny Crane for the defense.
Poor SFX- Really? By ILM, turn on a copy ST: 5 and watch those SFX and then re-visit that thought.
Student level cinetography- not clear if you are refering to Nimoy's direction or how the film was framed. I though Nimoy assembled the peices quite well and had a balanced approch to story and characters. As for the latter, their is an argument to be made that this was a "small" film and framed in that manner (no sweeping landscapes or romatic impresstions of the golden gate bridge; etc). However the moderate success of the previous film would make the limited budget neccesitate such restrictions, leading to a small film approach and focus on "ideas" & "characters".
Worst performance by a guest star in Star Trek's history 
- If we are talking of all films and not just up to this point, I would definitely suggest Tom Hardy (ST 10) of even the usually great F. Murry Abraham (ST 9). The role of Gillian Taylor, was made to be likeable, again in conjunction with that feel good mood, and as the advocate for the subject on hand (i.e. the Whales). She is perfect for what this task calls for.
I find nothing so needing of
cringe from this film, it was an inventive and thought-provoking if some what of a humbling approach to mans place in the universe.
This was not
insulting to the casual viewer/trek fan, clearly since it resonated so with many critics and audiances alike. And generally was well liked and appreciated by the majority of fans.
The idea for the story came to Nimoy after one too many martini's and a screening of Fern Gully!
The only thing I can reasonably possibly say to this is the maintaining of our biosphere and our ecology is a noble, ethical and wise endeavor, that not only protects our planet, the creatures that exist on it great and small, but clearly also protects
US,...from
extinction.
Now, why did the probe act in the manner it did. The short answer is
I don't know, but perhaps it wasn't evaporating the H2O, but absorbing it somehow/for some reason. I don't think it was bent on destroying humanity it just was ignoring humanity and focused on searching for the whales or an empirical reason on why contact was lost (i.e. an archeological dig this time in the oceans)
The
S H A T I N A T O R
