I've just realised what confuses me about MIB. In memory, I always mix up MIB1 with Independence Day...
Guy Pearce's make-up was pretty lame, but the iconic resonance of the crashed spacecraft & 'space jockey' scenes in Alien remains unmatched by the antics of Prometheus. In terms of Fan Art I'd say, fair enough, but I was expecting deeply mind blowing things from Ridley Scott on this one, not flute-tootling brutes treading over the same-old same-old alien sci-fi baddy ground. Maybe if I'd seen it in 3D the FX might have disguised the disappointments?
That said, I am going to see it again & will buy the DVD special edition to go along with all the others...