The 7d was certainly not one of the noisiest apsc, it was best of breed when it came out in 2009.
The 7D's RAW files look noiser to me than the T3i's RAW files. Same sensor right? I found the 7D RAW's to be overly noisy at ISO 100 with correct and often over-exposure compared to much older cameras even. I let my 7D go due to it, as everything else was great about it. Maybe mine was noiser than everyone else's?