BOS was a hastily cobbled together for a quick buck, no-brainer shooter. It traded in faithfulness to the Fallout universe for nonstop action, big explosions, and scantily clad "Brotherhood of Steel" soldiers. Sorry Interplay, wrong market.
Yeah, not only did it not look very much "Fallout-y," but as a game it wasn't even very good.
I didn't have a problem with trying to bring the franchise to consoles with some more action-packed gameplay, but pretty much every aspect of the visuals seemed to lack any signs that the team behind BoS had even really played the original games. Frankly, even as a "generic post-apocaltyptic" game, it didn't look terribly well art-directed.
Even overlooking that, it simply wasn't a very good game. I've played similar games like the Baldur's Gate one, and Bard's Tale, and actually enjoyed those quite a bit. Brotherhood of Steel just wasn't a very good game in it's own right, though. It had a number of gameplay flaws, and overall was just generally lackluster and not fun to play, to boot.
Most people just prefer to pretend that game was never actually made for those reasons.
I mean, had it been a good game, or even somewhat faithful to the setting, atmosphere, and themes of the original games I wouldn't have a problem with it. I had actually bought it when it first came out (and then returned it a couple days later.)