1 - The first in a legendary series and a new direction for the makers, it is still remembered with affection while seeming solid but rather clunky; many would hope for something lighter and more engaging.
2 - Often regarded as the high point of the series, this was an improvement on its predecessor in every way and still stands up as a classic today, the one that got everything right.
3 - For some, this was a rather disappointing sequel, 'good, but not great', and many of the ideas that went into it would be better served later.
4 - Well received at the time, and still a favourite for many, this is very much a product of its time and seems curiously dated today.
5 - Technically well-executed with some significant departures from its predecessors, but probably the hardest in the series to love.
6 - Another high point and made with the knowledge that this was the end of an era, the makers would bow out at the top of their game with this sophisticated product.
But that's enough about the Star Trek movies.
Ah, my opinion about ST:V is quite the opposite. I find it technically atrocious but oddly charming. It sure tells you something about William Shatner though, that when Nimoy directs him the character is pleasant and funny, but when he directs himself Kirk turns to a bit of self-absorbed loudmouth.