To start let me say that I was expecting a new and improved game, but instead I found myself with the alpha version of Doom 3.
1) In Doom 3 when you fire the weapon casts light. In Doom 3 BFG does not happen.
2) In Doom 3, the plasma rifle casts a little light as one approached a lot to a wall or object. This disappeared in Doom 3 BFG.
3) In Doom 3 at the beginning of the map Hell1, the transporter is located a little further, it is surrounded with a showing of souls floating effect. In Doom 3 BFG is not there.
4) Always hell1 the map, I noticed that the skeletons in the air you see in a strange way and that the flying monsters where you jump on the rocks floating "where they arrive for the first time lost souls" are completely dark.
5) In Doom 3 flashlight casts the shadow when you point to an object or a monster. In Doom 3 BFG has been removed.
6) In Doom 3, the fireball-throwing monsters cast the shadow of an object and another. In Doom 3 BFG has been removed.
7) The interface of ammunition in Doom 3 took off when mettevi weapon that had a display with the number of ammunition present. In Doom 3 BFG interface is always present. (This seems like a silly thing but it is not because if I put the BFG 9000 and I want to fire a shot at full power, the interface I covered my view of the display of the weapon).

Do you even know what you're talking about? The alpha version actually had more dynamic shadows, and even had self shadowing. What you mean to say is unfinished, but the alpha version from E3 2002 is something entirely else.

Yes, well, he clearly meant that whole "alphas usually look worse" thing
I wouldn't expect any new Doom3 fans to know about the early leaked "alpha" demo.

you now that I've seen the alpha version I realize that ruined all the work. The version bfg is just an insult to the game itself.

Yep, lol. Once you've seen the alpha version you've seen how great it could have been, but never was.