I don't hate Michael Bay like some do. I actually think he's comparable in many ways to Spielberg, who I also don't hate (but am not a huge fan of). Some of his stuff is pretty corny and cheesy, but the same goes for Spielberg. Bay's stuff is usually visually and technically very high-caliber. Transformers was fine, it just tried to be family friendly and had too much comedy. TMNT was already kind of comedy-ish to start with, I don't think it's outside of Bay's skill set. TMNT is colourful and fun, it's not a deep and nuanced property that needs some French art-house director helming it.
Pain & Gain was good fun and shows that Bay's not just an explosions and slo-mo blockbuster machine.