I just went back on this topic to say that I agree with that, lol.
After finishing it, I feel very disappointed about this game. No nature, no forests, electro dinosaurs and where's Regina ? Where's the original gameplay of the series and why did it turn into a weird sci-fi platformer? Total fail. They could have made something like Just Cause, with a free roaming setting in a vast jungle... but no.
Really, I gave that game 6/10 on gamefaq as quick review just because of the graphics... because all the rest is just a waste (and wow, I just saw the price for the unboxed version of this game is around 700$, lol). At least Gun Survivor 3 (the lame fps version for PS2) has a jungle in it!