The ending really ruined the ending for me...
Spoiler:
One minute he was escaping from a tripod, then, totally unrelated, the aliens were dying. We're all saved!
The crop dusting/red weed, gory okay, but not really explained properly. Was that from the book?
The machines must have been buried thousands of years ago, but why bury them. Man at that time would have been very primitive at the time. I suppose, they must have seen potential in us.
Further to the above point, if correct, did the aliens not evolve/develop in that time? I mean that would be like someone around Roman times stashing a load of swords and us, now in the present, using them to invade another country.
If the aliens were here before, did they not know what would happen to them? I mean they took all that time to bury all those tripods, yet they die within 2 days of the invasion.
I was actually enjoying the film, aside from the above, but that was the last straw.