Mercinaries 2 came out in 2008.
Mercinaries one came out before JC1 came out.
also just cause 2 isn't better, it's just got fancier graphics.
and better gameplay if i do say so myself
and the graphics are quite nice, but the size and detail of the whole islands is magnificent
mercenaries has better weapon selection and you can bomb random stuff
but collateral damage is plain dumb, i got my collateral damage up to about 500k per kill and then i stopped playing