'Guardians of the Galaxy' is a visual, interesting narrative with overcooked, but seamlessly innovative strings. It doesn't carry any patent ideas, and always feels fresh throughout the viewing. I loved these sub-supeeheroes because they've justified through their fun acts why they are original heroes in their own right.
Guardians of Galaxy is the only lyrically perfect and visually stringed into layers film in the whole Cinematic Universe. I am eagerly waiting for the third volume, although I enjoyed the second one to the least. Do you know that Thanos made his first appearance not in Infinity War but this one, actually? (Though there is zero mention of Infinity Stones). The characters are a total cinematic achievement and I recommend that to fully understand the stories (and how much did Thanos destroy in Infinity War), watch it.
But the film does come with a little slow pacing and needlessness of the narrative strings. Its emotional weaknesses, which are also the bumps in the film's otherwise perfect scripting, do make it less impactful than 'The Avengers'.
But the film is more, universally beyond watchable. Its dazzling, feel-good fun. I am going with 3.5 stars for the Vol. 1 of 'Guardians of the Galaxy'. It is the right kind of fun, one of the best movies this year.