TMP is a great science fiction movie that shows us how interesting a simple (yet straightforward) story can be. It has its pacing flaws but it was a great starting point and is still by far my favorite Star Trek movie. It's the only one that I keep revisiting very often and this is the movie that got me hooked into the Star Trek franchise! Also it has a superb soundtrack and stunning visual effects that aged pretty well and are believable even nowadays.
Heck, a movie that has Blaster Beam sound effects can't be bad at all