Both the Durge endings after you initially accept Bhaal are bland. Either you just get a boring ending where you take over the netherbrain, or you get an ending where you completely lose yourself and no one seems to miss you. In the end I felt like I was pushed to go back and do the resist route to get a satisfactory ending, which is kind of a bummer. I had planned on it anyway, but I was going to do a new run to get the resist endings. But after those endings, it didn't seem worth it so I just went back in my save files instead of doing another run.
Yes, and even when you resist because you might still want to be an evil shithead, just not controlled by Bhaal, you somehow are forced to feel remorse about your victims. Another example of railroading.