"Better than okay" compared to . . . .?
Compared to all other 5th-year LBs in 2012, he was 1st in total tackles, 1st in forced fumbles, 3rd in sacks, 4th in passes defended and 4th in INTs.
Compared to other LBs (of any experience level) who were among the top ten in tackles in 2012, he was 1st in FF and tied for 1st in sacks. Actually, only one LB had more FFs than Mayo in 2012. Spikes.
Compared to other LBs who have spent their entire careers so far on a re-building defense? Or to guys who have had the opportunity to develop on an established defense with quality veterans?
Compared to other LBs who have played the same roles in the same schemes? I mean, Mayo started his career as an ILB in the 3-4, but his role has been shifting around continually since then as BB's scheme has changed and evolved.
Or are you just comparing his stats (so far) to those of all-time greats like Ray Lewis, London Fletcher, Bruschi, etc.?