Not at all... 4 target sleep for Venus only exists in the other WL versions. At least for now. Ours is only 2 target, even at max lvl 10. She never RB's and even when you burst her to 180, she STILL sucks, without lot's of lething usually. Compared to a RB'able pet like Shasha who would easily have much more INT after RBing and lvling, and can freeze 2 targets.

I have 2 Venus & 1 Athena, and done that quest a bunch more times too. It's really not worth it at all. There's a 100 Athena someone has in my guild, and she is good compared to a 100 Fred, but as soon as Fred RB's, she is really nothing to compare.