TWF is a Feat selection with pre-requisites. I like rogues, but they work better in a group than solo IMO, because their best attack is their Sneak attack which only works when someone else has the aggro.

Most of us try to have a few chars at various levels so we can team up with other guildies. I currently have levels 4,7, 10, 12 and 20. You can usually group with someone who is 2 levels above or below you without suffering an XP penalty. This may be dependant on the quest level as well.