mindless shoot'em up
No more mindless than Call of Duty or Doom or pretty much any "shoot em up".
with boring identical interiors
Ok, agreed. Although the earth level from the tank/bridge sequence all the way to fighting the spider-mech was awesome fun.
and no coherent plot
Huh? I followed the plot quite well. Not exactly happy with the abrupt "lets leave some content for Halo 3" ending, but it definitely wasn't incoherent.
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