Great fun, in spite of the contradictions.

Rating: 7/10 (17 March 2013)

I like the trilogy and in my opinion, they are all necessary and fit together. This is an enjoyable movie and can be taken as a unit, although there is some need to refer back to the previous episodes, in order to understand the beginning and make proper sense of the ending. It's a nice conclusion to the trilogy, because it ties up the loose ends and resolves some of the plot that was left hanging in Part 2.
However, I have a problem that I can't resolve and I may be just misunderstanding something, but I don't get why Doc is missing at the end. At the start of Part 3, we know that Doc has gone back to 1885 by mistake - we found this out at the end of Part 2, when Marty receives a letter. Marty is now in 1955 (also by mistake) and he wants to get back to his original time, i.e. 1985. At the same time, he needs to return to 1885 to rescue Doc who is in danger of being shot. The 1955 version of Doc helps him to do this and this version of Doc remains in 1955.
Marty goes back in time, finds Doc, eventually solves all the problems and returns to 1985. Then he says that he misses the Doc, who remained in 1885, but what has happened to Doc from 1955 who should have just got older? I know there are plot holes in all the films, but this has really baffled me.
Apart from this issue, it's a fun film and I don't think it is a massive disappointment. It is Part 3 and it deserves its place in the series.