I don't know about this, but Lost Planet 2 has one of the best co-op campaigns ever made.
Think of it like if Konami actually got off their chair and made a quality 3-D Contra. Of course the stage setup has some really short stages and some long ones, but the length, overall replay value and challenge at highest difficulty is levels above other things out there.
I don't like the direction they are going with Lost Planet 3,
who knows if EX Troopers or LP3 will have the one feature that enhanced the replay value, which is protagonist customization/edit. You can customize your own character
using parts from other models used in the game, including enemies, female characters, and even some crossover DLC characters. (of course to use this feature you have to beat the campaign once, but it's a great feature!!)
Lost Planet 3 does ground and mech combat better than even Front Mission games. You mostly fight on foot, but there's so many cool things about LP2 including that grappling hook that adds more dimension to mobility and combat.
The T-ENG system is well done, the skill system, unlockable weapons, you can even have your own personal loadout. And the best weapons are so cool! Including some nova looking bombs, frizbees, and all sorts of ballistic and energy weapons.
AND LP2 has TEAM ATTACKS! With the right weapon setup you can COMBINE your weapons/support to create different types of SUPER WEAPONS, including one that like rains down a supernova onto the battlefield, another with a gigantic laser, and another that produces some kind of sword.
Character interaction wise, LP2 jumps between perspectives in the story, but all of the episodes are entertaining and really epic as a whole, especially the desert pirates one!
And many great epic massive bosses to fight!! There are even many ways to use a battlefield, like one stage, I didn't even notice there was a mech stationed somewhere until several runs later.
Also certain mechs you can COMBINE into an even more epic mech!! And yes you can repair mechs, pull out their guns and use them yourself, or attach those weapons to a new mech.
the train boss battle is one of the most epic bosses ever (the one where you fully operate and maintain a train. Keeping it cool, loading shells, enhancing shells, turning/aim the giant cannon, cleaning up akrids that get on the train, turrets to operate, I even think there is a helicopter you can pilot, etc. )
If there weren't great titles released after LP2 I would still be playing it, but although I am playing RE:ORC, LP2 is longer and overall better than any other shooter, campaign-wise, IMO.
But don't base the greatness of Lost Planet 2 with LP3 or EX Troopers, who knows if their full scope of features, gameplay and level design will match up with Lost Planet 2's.