I actually liked the ending, especially Michael's death. At first, it was literally shocking to see his grave, but later I realised that it would be the best for the show's lifespan. If Michael lives on, Prison Break would've had two more seasons, which wasn't profitable for Fox, as the show has had a massive decrease in fans.
My jaw literally dropped when Sarah shot Michael's mother, I never expected that to happen!
As for Alexander Mahone--was he not supposed to be with Pam instead of his friend from the Bureau? =\
'twas an awesome show after all.