BG 1 world was very interesting, and everywhere you went there was stuff going on that would drawn you in.
I.e., you're exploring a apparently empty area, then you see some ankheg attacking. Kill them and you get their shells to make armor (meaning now you want to find a blacksmith). If you enter the farmhouse nearby, they tell you how their son went missing. Go into the ankheeg hole nearby and you'll have a mini-dungeon to explore, any ankheg to kill and eventually you'll find the boy's body. Also, outside there's a ankheeg hunter that controls the population of ankhegs and will limit how many you can kill. Also, the ankheg shells weight a lot, meaning carrying them requires some planning, but you make armors or sell them for some good gold.
All this is one part of one area in the game, with absolutely no relation to the main story. There's nothing in W2 like that, even entire areas like the Leve'Lupe Mine or the Infected Village have less content and relevance than this. Those can't hold a candle to the Gnoll Stronghold, for example, that is a cool optional area constantly talked about by various NPCs in the background, and leads to Minsc and Dynaheir, or Edwin.
Yeah, these are the same arguments I used in the "full scale RPG" argument with VD, to argue that Baldur's Gate was indeed "full scale". Some people aren't impressed by these inherent advantages of fantasy settings.
For the nth time you use this same shitty argument in this thread... A good designer could make W2 setting be extremely exciting. It already got guns, mutants, radiation, nuclear priest, robots, raiders, etc, but uses them horribly. The world is full of mutants, crazy raiders and robots, but all you get to play is a bunch of police officers going pew-pew behind cover. And 99% of your enemies are either humans with guns also going pew-pew behind cover or giant animals that just run towards you.
Just take a look at Gamma World or even Deux Ex to see how you don't need magic to make a awesome setting that's full of interesting things. Fallout was supposed to be a more serious, toned down setting, yet Fallout Tactics lets you have super-mutants, deathclaws, ghouls, robots, flamethrowers and even a goddamn tank!