At Wharton we take measures like your GPA, your GMAT and your TOEFL scores as examples of your ability to handle the (not simple!) academic curriculum here. One problem with the combination of good test scores and a poor GPA is that it may give the impression of 'smart but lazy'. If it is evident that you pursued many other enriching endeavours during your time in school, this may mitigate the case somewhat- although it really depends case by case. The famous "Fanatical Fan" (Check Wharton's S2S) got into Wharton as a reapplicant with a GPA of under 3.0, so there are certainly people who get in with poor GPAs.
At the end of the day, if you've been very successful at work, and have good reasons to attend Wharton over any other school, apply. If I had listened to the posters on CD or businessweek forums or any other forums, I, straight out of college, would not have applied and been admitted to Wharton last year. The only sure way of not getting in is by not applying.
mba programs are looking for leadership experiences, which are not necessarily equivalent to managerial experiences as for low gpa, the adcom will look at the trend (i.e. do you get better grades in your upper-division classes?), not neccearily your overall gpa