http://www.whatnottosing.com/ keeps a database of all the songs sung by people on American Idol and how the songs were ranked. They use various news sources and blogs and such to get the ratins of the song. I'm not putting the standard deviation for each number and I will be doing a season average as well as a the weekly numbers
They don't usually get them up early enough for prediction purposes but it shows who the critics like and who they don't.
The average rating for a debut episode is 44.7. The girls averaged 44.3 and the guys averaged 37.0 (numbers here from the article on this week).
Weekly and Year to Date numbers
78 Crystal Bowersox
72 Siobhan Magnus
64 Katelyn Epperly
62 Lilly Scott
61 Didi Benami
58 Michelle Delamor
43 Katie Stevens
26 Paige Miles
22 Janell Wheeler
14 Ashley Rodriguez
12 Haeley Vaughn
7 Lacey Brown
83 Casey James
75 Andrew Garcia
57 Lee DeWyze
44 Michael Lynche
41 Aaron Kelly
31 Joe Muņoz
30 Todrick Hall
26 Tyler Grady
22 John Park
18 Alex Lambert
13 Jermaine Sellers
4 Tim Urban