Depending on the theater one saw it at (and I mean, even specific screens at multiplexes), it was either fine, or dark and muddy and hard to see anything even in the broad-daylight scenes. This is a thing with digital projection, where the bulbs need to be replaced religiously -- and not delay as long as possible to save money. For reasons I'm less clear on, failing bulbs had more of an impact on how clear/bright Solo was, compared to others that have the same theatrical considerations.I only ever watched it at home, and my recollection was not that the film was particularly dark. Granted, I'm usually watching on a plasma with the "THX Bright Room" setting on, but it seemed about normal to me. Was this something that people have noticed at home as well?
But yeah -- I saw it at two screens in one theater opening weekend. First viewing was just fine. Other screen, the bulb was starting to go and it was dark and muddy the way so many complained about.