For the typical person, BMI is indeed somewhat useful.
Weight (kg)/height2 (m2)
<18 . . . (underweight) anorexic drama queen
18-25 . . . OK
25-30 . . . (overweight) getting seriously pudgy
30-35 . . . (obese) put down the doughnuts and pick up a gym membership
35-40 . . . holy crap . . . you're FAT
40+ . . . bariatric surgery R Us
Although elite athletes (in strength sports) can produce warped BMIs, the assessment is still predictive. A study published in 2004 demonstrated that players with BMIs>32 had a relative risk of cardiovascular death (heart attack) that was 6 times that of players with BMIs<28.
In essence, being a big fat lineman is bad for your heart.
As for a bodyfat percentage of 35 . . . that sux.