I think being bad makes you care less and you miss out more. I always have to play good the first time. Also, in some games like Fallout New Vegas, I play such a middle grown and try to please everyone so long as to not cross any lines.
The only way I can really be a bad guy in a video game is if I plan out some kind of arc or backstory beforehand. For example, before I played Mass Effect (near the time ME2 came out, so I knew my actions would be important later) I decided that my Shep would be suffering through a gradual Darth Vader-esque fall from grace.
Or in Skyrim, my dark elf Harold Bloodshadow is lashing out at all of Tamriel's anti-dunmer racists. He just hates them so!
What's so funny about these type of games that have the morality meter like InFamous, Fable, etc. is it is actually harder to play as a good guy. It's harder to not kill everyone onsite or aim for an enemy and not hit any innocent bystanders.
That is why I usually go the path of the angels, way more of a challenge.
I even managed to finish Festival of Blood's story sucking less than ten civilians. And eight of them were mistakes, hitting the wrong button too close to a passerby.
i do good story first then i do the evil story. being evil is just more since you do anything with out worrying. and infamous makes the game easier since the powers are way more cooler?
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Or in Skyrim, my dark elf Harold Bloodshadow is lashing out at all of Tamriel's anti-dunmer racists. He just hates them so!
That is why I usually go the path of the angels, way more of a challenge.