Again, my post above was a joke. Without a healthy sense of humor you should not go down the medicine route (read House of God for some insight as to why this is so).
But comedy aside, I disagree with some of the implications of this above post. Sometimes a healthy dose of reality is the best help one can provide. It's nice to believe that all deficiencies can be overcome, but the reality is that some can, some cannot. The folks who constantly play cheerleader often are the most harmful people on here, because they may cause folks to spin their wheels eternally and pass up other opportunities to have a good and happy life. Telling someone to follow a dream they cannot possibly attain would not be help. Having someone sit you down and set you straight is good once in a while is a very positive thing. (Again, that's not what I was dong in my above post, but I think there is room for this kind of cynicism on SDN, and it plays at least as important a role on here than the cheerleading).
I think most folks on here can dig out of most holes if they are willing to put in the time. But there are starting points that could mean many many years of grade rehabilitation. There are also the folks who have exhausted MCAT retakes, have been expelled, have huge blemishes in their backgrounds where it is less likely they will ever secure US admission. Advice has to be realistic and targeted to specific backgrounds. If eg someone doesn't have a prayer of getting into a US allo school, they should know that going in -- you are not doing them a favor letting them get blindsided.