I made these for NCAA's Heisman level and I love them in that game, and they translate pretty well to Madden. Give them a try.
If you want to read the whole thread on my philosophy/how I came up with them, etc, click below to check out the original thread. It's prolly a good idea to read that thread to get an idea of what kinda of sliders they are and if they sound like they fit your style of play.
ehh's Heisman Sliders for All-American Users
Level: All-Madden
Clock: Accelerated
Human Off
QBA: 99
PB: 99
WR: 99
RB: 40
PB: 35
(35/30 or 30/25 are other options for running if you like to grind it out)
Human Def
AWR: 35
KD: 60
INT: 25
BB: 60
TK: 50
CPU Off
QBA: 55
PB: 25
WR: 60
RB: 35
RBlk: 50
CPU Def
AWR: 10
KD: 10
INT: 0
BB: 15
TK: 15
For special teams use your own I'd suggest, but I'm using...
Human
FGL: 40
FGA: 55
PL: 45
PA: 45
KO: 50
CPU
FGL: 30
FGA: 25
PL: 30
PA: 40 (they're very good on downing punts inside the 5)
KL: 25