Season 4 was good, but not quite as good as season 2 or 1. Maybe as good as season 3. I didn't like the non-chronological shit they did. I appreciate it, it was a neat idea, but I didn't need it. There were like 2 episodes or so of Season 4 that seemed super mediocre. I think the Michael episodes themselves were super weak.
That said, the Tobias To Catch a Predator thing was amazing all around. "Come help daddy get his rocks off!" and the fact they eventually get him outside by saying "there's a raccoon outside" "BULLSHIT!" *proceeds to go outside to see a raccoon and gets tackled*.