the only thing that i can say i didnt like about the alternate ending about how batman defeats the riddler was a rip off of the crow, it was alot more along the lines of the "30 hours of pain all for you" except it was about riddler wanting to know what makes batman who he is, so he looks into his eyes and its basically suffering and pain then overcoming darkness, because only he can endure it, because he chooses to, then it freaks riddler out into a screaming frenzy
The reason why he killed two face is also explained because he didnt want harveys death to be robins burden to live with, batman can live with the death of harvey dent