You should try running away when they get too great in numbers and take them out either one or two at a time. Just keep and eye out for the bomb things that they drop, if you see one run away or hide behind a car or something.

ok swithch to wolverine or any body go to your characters menu (not from the extraction point) then presscircle on one of the players them press right on your directional button now put your first bar the one thats has you first superpower fill it all in so the first superpower you have can be ultimate exite and keep on doing you first superpower over and over it will make it much easiaer

after you beat a sentinal go to the save point and save so when you die you can continue.