1) Stoops has won 1 national championship in his 12 years. ohio state, of course, also has 1 national championship in the same span of time. Lateral move, from that perspective. Wilkinson and Switzer each have 3 to their names. There are, of course, just those 7 championships in Sooner history.
2) Stoops' 129 wins in 12 seasons gives him an .806 win pct, third all time and just behind Switzer (.837) and Wilkinson (.826). Of course, Stoops has also coached 13.3 games per season, compared to 10.5 for Wilkinson and 11.9 for Switzer. That makes things a little tougher. In fact, Stoops is averaging 10.75 wins per season, compared to 8.5 for wilkinson and 9.8 for Switzer.
3) Stoops finished in the AP top 10 eight times in twelve seasons (75%). Switzer did it 12 out of 16 times (75%), and Wilkinson did it 12 out of 17 times (71%). Stoops compares very favorably.
4) Oklahoma has 5 Heisman trophy winners - 1 under Wilkinson, 1 under Fairbanks, 1 under Switzer, and 2 under Stoops.
5) There were 36 AA's under Wilkinson (2.1/season); 51 under Switzer (3.2/season); and 32 under Stoops (2.7/season).
In conclusion, your assertion that Stoops doesn't seem to approach the status of Bud and Barry seems flawed.