sharon will dimise be4 15 may - Ariel Sharon? He died in 2006.

mandela will dimise be4 15 may - Yes he died at 94 years old. He was 90 at the time of the prediction, so pretty safe bet he'd die soon. The predictor didn't mention a year, but it is assumed on GLP when someone says "before XYZ month" they meed the CURRENT year, not 4 years later! Way to hedge your prophetic doom!

thatcher will stroke be4 15 may - Fail. She had strokes back in 2002. Once you have them, you get them again. Anyone could predict this.

japan warring thing will commencecing before 15 may secretely - Nope

oil gets very big sickness no use anymore after 15 may - Nope, we still use oil

old bush will very sick be4 15 may - Bush Sr. is getting old and he looked frail back in 2008 when this was posted.
cheney will dimise be4 15 june - Cheney has heart issues and other health issues pre-dating 2008. But he's still ticking.

obama accident before 27 aperil - In light of the March 15th 2008 prediction before Obama won the Democratic nomination, I'm betting the poster was hoping the Clinton's would knock off Obama ala Vince Foster so Hillary would get the nod and the poster would look like a prophet.
big sickeness be4 15 may - Nope. We have a flu epidemic this year, but relatively few deaths. And predicting sickness is pretty vague.

very moving earth on 17 aperils - Nope. No major earth movement

oceone not sleeping when heaven things beware many waters to come drown - Nope.

brown cheat be4 15 may - Not sure what this means. Who's Brown? Chris Brown (entertainer). Gordon Brown, PM of Britain? Brown is a pretty comnon name. And cheat on what? His wife? taxes? It is true Gordon Brown was accused of fiddling with his reimbursement expenses, so I'll give a begrudging lucky guess here.

putin missing after 15 may many worry poeple do crazy things - Nope

Overall, I rate this near absolute failure.