Mech simulators for PC died after Mechwarrior 4 circa '02. The newer stuff like Hawken or Titanfall are basically mech flavored FPS more than actual simulators. I can't recommend anything new in that vein because there really isn't anything new, at least not for PC. What I can do is tell you some good ones from the mid-90's that are lesser known, back when this was still a popular genre:mcpop9 said:hello people, i've been searching around and noticed a lack of many newer pc mech games outside the ones that are rather "big" right now such As Hawken and Mech warrior online. Anyways, i'm looking for some mech combat based games to play. The newer and more customizable the better. Multiplayer is also a big bonus.
http://en.wikipedia.org/wiki/Terra_Nova:_Strike_Force_Centauri
http://en.wikipedia.org/wiki/Shattered_Steel
http://en.wikipedia.org/wiki/G-Nome
->This was Titanfall before Titanfall.
http://en.wikipedia.org/wiki/Ultrabots
http://en.wikipedia.org/wiki/Krazy_Ivan