Easy, but fun. The first was the best, despite inability to strafe >_>. It had the best plot, best weapons, and wasn't just a hoard of easy to kill enemies that take forever and are boring... Plus I like the gold Pyrociter.... And gold blaster XD Bouncy shots FTW!
The second... uh... Locked & Loaded? That had the best Story evah! I seriously loved the story, but along with that it was also the most difficult in the easy series, and had kinda cheap ideas for weapons... I did like hoverbike racing though....
Up Your Arseenal was fun, but the multiplayer is what really made it shine... I love beating my friends senseless XD
Size matters was strange... It felt like the first one yet played like the third... I did like it, but it wasn't the best...
Gladiator was disappointing, was still fun for awhile...
And whatever the name of the PS3 one was pretty decent, there were a couple of weapwns that were awesome, but the story was sub-par.
Anyways, great games, lots of angry robots, and enough explosions to keep me occupied. A great game series that I respect *gets up and steps on plastation2 while getting water*