Before seeing Guardians of the Galaxy Vol. 3, I wondered, as I always do with these sorts of “finales” to long-running franchises, how difficult it was going to be to review Marvel Studios' latest without diving into spoiler territory. Thankfully, though, most of writer/director James Gunn's trilogy-ender can be easily discussed without addressing significant plot twists or which of our eccentric world-savers, if any, fail to make it to the end credits. It turns out the stuff that bothered me, which was about 80 percent of GotGV3, is right there in the open.