I LOVED this episode; Luthor's plotting, the supervillain battle, the end of Grodd, but I have a few problems with it.
1) What Luthor did to Goldface didn't seem like that much of threat,considering he was fighting later on.
2)The bad guy battle was good, but it didn't really say much about their powers. Some of the villains just threw punches at each other.
That said, I love this episode. Luthor really came prepared, with the means to take down Grodd and Tala on hand, and the way he finished off Grodd was pure classic Lex.
The awesome cliffhanger left on the edge of my seat; I couldn't wait for more!