You got a point there, but I just don't see many people rushing out to see a bad movie about tornadoes with the unnaturally high number of tornadoes, even ones popping up where they never did before. Aside from that, yeah. Michael Bay couldn't make a dumber movie. Between that and Step Up "Sort of Hunger Games-ish concepts version," TMNT is pretty much the Lawrence of Arabia of that week's releases.
Still, you gotta wonder... what delusions of grandeur did Disney/Marvel and Paramount have to release 2 blockbuster films in August? I've never heard of a big budget movie doing well in that month. Hopefully the big name brands behind them will grab some audiences. GOTG toys are already selling (at least the minifigure 3 packs), and Marvel has been getting the word out about the characters via Ultimate Spider-Man (twice) and Avengers Assemble.