Ok, i admit he has a strong bond with his twin. But if you look at the way he treats other people, he's less than honorable anyway. I won't proclaim he's (in ad&d terms) true evil, but chaotic neutral at least.
Also, the way he left Chrysania to die in the Abyss while she was about the only woman that ever loved him, doesn't make him a very good person from my viewpoint.
Though i must stress: He earned my sympathy simply because of the great pain he has to andure and because he actually liked Tasslehof and Tasslehof _is_ my alltime favourite Weiss&Hickman-character.

Evil people kiss their wives and kids, too.

Nothing about evil precludes love, it just implies that a person thinks that malice, abuse, domination, and cruelty is 'appropriate' or 'right' (or, for that matter, 'justifiable')... Even if only to a smaller segment of the population. The honorable, kind, merciful person who gives money to charities, sponsors scholarships, pays his nephew's tuition, etc., but who has always hated black people (or Mexicans, or whatever ethnicity) and pagans (or atheists, or Lutherans, etc.), is *still* evil.

Remember: No one ever thinks they're evil.

Raistlin? Definitely evil... But people are complex, and sometimes good can come from the actions of evil people.