Just 3 simple exemple that are exactly the same in DoS :

1) The way they move the rocks and other items.
2) The way they can throw grease and flame it.. (same for the barrel)
3) The line appearing for you to target ennemies...

I'm not saying this is bad, I llove BG1 and 2 and I like D:OS... But open your eyes if you don't understand "why people say it's the same".