It's an interesting theme today, with words that mean LIGHTNING in four different languages. We're big fans of languages here at Horace and Frannie and Colum, so put the theme squarely in the plus column. The BIRMINGHAMBLITZ (42A: Luftwaffe attack on the British Midlands, 1940-43) is probably known only to history buffs nowadays, but the other two foreign entries, especially CHOCOLATEECLAIR (26A: Custard-filled treat) are well-known by most people.
There were ASPECTS (15D: Things to consider) (like that) that were more fun. NERUDA (6D: Poet Pablo who won the 1971 Nobel Prize in Literature) is always popular, and it's sort of interesting that WEEP is beside HAHA (2D: Laugh) in the NW. And how can you not like BEAMUP (42D: Bring back to the Enterprise, say)? But overall I didn't love the fill.
1A: Brainiac (WHIZ) - Meh. C+ . The plus is for the Z.
Favorite clue/answer - 64A: Fudge, as a rule (BEND). I hate the expression "fudge the rules," but I love fudge, and besides, there's not much competition.