yeah i reckon that this boss was the hardest in the game because he was so unexpected - also, i played through the whole game before doing any challenges.
i really recommend that you do some challenges first and unlock upgrades.
to defeat the boss i had a very limited arsenal but here was the gameplan.
run left to box. L+R to target the minicannon at front. threw 2 frags then expended my 6 last shotgun shells. this should put it to about 400-450HP. the box you are hiding behind will only last about 4 rounds of fire from the minigun. as it explodes i grabbed the health (cos i was only 50% to start with) then rolled behind the main central box.
he pummels that and as he is reloading, run to the bottom left crate, grab rocket launcher and more frags.
roll back to main central box. L+R to target mini gun again. frag it. then step out and blast it with 3 missiles.
at this point you should be dodging lots of his rockets and this is about rollling running and L+R. it is a pain in the ass but you need to take out the minigun.
when the minigun is on about 5HP and you are relading the final missile he will probably release the spider mines. run and grab the Assault Rifle and stand in a corner. as they bunch together, shoot the first one and the explosion should kill the others. go and finish the minigun.
keep dodging his rockets and run to the bottom right crate and grab the sniper rifle. now just roll, run and L+R and focus on the Rocket launchers. whenever he releases spider mines, go and grab the assault rifle. dont be tempted to take them on with your sniper rifle! just repeat this until you run out of Sniper and then carry on with the assault rifle. keep at it... it is one of the most frustrating fights i can remeber in recent gaming history (it took me 87 attempts lol!) but is worth it.
once you have done that boss, the rest of the game is piss.
on another note, i love this game. just wish the single player was longer.
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