I took a liking to the legion because of there efficancy and the fact that no group as large of the legion is comprised entirely of evil people. Thats like saying nazi germany was made entirely of jew hating people.
A dlc would help because bethesda has laid the foundation of a diffrent point of view for the legion. Ask raul, ask other people, the legion isnt entirely designed to be the evil option in fallout new vegas
I've asked everyone in game and read the articles on VB which show a more open view, so I hold little bias to any faction.
Raul say's they have done some good and stopped raider attacks out east, no details and fails to mention if those same raiders are now members.
Gloria Van Graft ( evil ) says they've done wonders, meaning caesars complete domination of his subjects.
Trudi / Sunny mentions that they've heard rumours, but may believe them to be NCR propaganda.
Two / four quests in it turns out all to be true.
Dale Barton says they have done well, but is fearfull of crossing them.
Cass is biased, shows that they could be good for certain people, but are completely wrong in general.
The Weathers family show they attack anyone they can on sight for slavery, except the PC strangely.
The optional side quests around the strip show they have no qualms about killing as many innocent people as possible for no reason than terror.
They may not at one point have been planned to be the evil choice in game, but they are atm.
The NCR have neutral feelings or even supportive ones shown by blood enemies.
The Legion has no friends outside of hostile, agressive and mostly evil factions.
Finally the Karma systems is rubish, but shoot the leaders of CL you gain karma, which means the Dev's intentionally set them as evil.
All this is from unbiassed accounts, and has been posted as neutral as possible.