I remember you can explore Aleroth in the original game. Just jump on the flame holder under the tunnel when you first enter Aleroth and from the flame holder, jump over the fence and into the courtyard where soldiers are fighting zombies. From there, you can explore some of Aleroth but some parts are missing. There are also a few crates with random loot in.
I didn't like Aleroth in the expansion, I liked the war torn Aleroth better. The expansion one looked too bright until you came into the alley with the undead which made everything turn darker.
