I agree. The original movie posters for original films (ANH, ESB, ROTJ) were really fantastic.
ANH had a somewhat retro (to me) 70s feel to it and the Frank Frazetta inspired poses. Felt exotic and a like a modern take on the imagery of Flash Gordon and John Carter of Mars.
ESB's poster highlighted the drama, action and slight romance in a perfect way.
ROTJ's poster finally placed Luke as the center piece.
Struzan's SE posters, while technically amazing, are somewhat dull. Had they actually been the covers for the DVDs that would have been nice though, giving a contrast to the original VHS CBSFOX art of the past. I also appreciate the color palette of the three. Brown, gold and tan for the 1st poster representing Tattooine and palette in the film. Cold blues and white for ESB representing Hoth and Cloud City. And green for Endor and the Lightsaber in ROTJ. They are very nice alternative posters for the movies that I wish had been used for the DVD releases.
However, had I never been exposed to the original posters I would think they are quite boring, or at least not reflective of the film's emotional impact. Why is Chewy represented do much in Struzan's ROTJ poster? Right next to Jabba?
I think his prequel posters are worse though. He did something different from the other posters by having Luke and Vader only appear in small silhouette, no heroes appear on the ESB poster, and each one having a distinct color palette.
The prequel posters though, at a glance, look roughly the same. Same color schemes, same collage usage for the characters. I'm just noticing now the theme symmetry of Anakin and Obi Wan's silhouettes on Ep III as compared to the ones appearing on ROTJ. That's a nice touch but the correlation is too subtle because it's dominated by the big heads floating.