I'm a student at uni doing civil engineering so I figure I know a little about this stuff.
But to get a proper and accurate answer you'd need to sit down, with all the data, and work it all out. and only the guys on the commision have that.
From what i've read though, the two towers story seems legit. As in i don't feel there would've been a need for explosives.
WTC7 though, is another story, that's got dodgy written all over it and really doesn't make much sense.
The "hi-jacker" story, also has plenty of holes, though I've got no idea what the truth is, i know that the official story simply doesn't add up with the fact that some of the alleged people are still alive.
Also, did everyone forget about the pentagon? Now that one is really weird...
The telephone or power poles that got knocked down cause the plane was flying so low? that just sounds so wrong... but whatever, the main thing i'd be pissed about is that all video footage was confiscated.
I mean they could shut everyone up if they just released it.
Although since it's been so long i'm sure some nutball would say they were just stalling for time to edit it.
Anyways, the whole thing is dodgy, but i don't really care anymore, it's not my country, hopefully the total story will come out one day.