The plot was not good.
The special effects weren't.
The acting was... not very good at all.
Like others, I felt there were numerous holes in the plot that you could fly, well, a space shuttle through.
I thought the ending was rather unbelievable.
By the way guys, about the "blow torch in space".
Blow torches have their own supply of oxygen (Hence the name "Oxy-Acetylene torch"). Two hoses run from the torch: One to an acetylene bottle and one to an oxygen bottle.
So a "blow torch" would work just fine in space.