ST2 - saw this one again on 4K and it's not as badly dated as all that, and there's nothing wrong with the pacing either.
ST6 - not perfect, but Meyer and co were clearly the visionaries for 80s Kirk Trek.
ST1 - the only true sci-fi-centric outing. While I appreciate good drama, which can be more engaging (see ST2 and 6 above), ST1 has its own balance of plot elements - and a size of scale that wows on the first viewing and, as long as re-viewings aren't too quick, still hold up.
Honorable mention 1: ST3. It's a bit looser with TV episode continuity, not to mention movie continuity as Saavik was unfairly harsh to David and pretending this planet came about from scientifically equal conditions to their prior tests*, but so much more works in its favor compared to the plot holes and other points.
* They can test under controlled circumstances to a not-dissimilar element and then extrapolate to scale (but might still have problems, true), but going from an underground hollow with a small device up to the entire Genesis torpedo detonated inside a teeny tiny starship. A teeny tiny starship of (a) immensely different mineral/material composition and (b) a big-ass energy-producing splodey-makin' source that no planet naturally has, the variables are too numerous and sizeable. Saavik of all people should have grasped that. /tiffy
Honorable mention 2: GEN. It's flawed as all heck, partly due to being rushed along with finishing up TNG the TV series, but some of the philosophical themes are really good. It deserved to be a ton better and not cramming in so much, which is easily its biggest problem. But it's the best TNG movie of the four. Note there's no asterisk, GEN's problems are far more numerous and sizeable despite its positives...