They kind of dropped Rogue's importance after the first movie so she didn't even get chance to develop from who she started as to being the Rogue that fans know and love. Paquin did a good job with what she was given, but she wasn't given much after the first movie.
Bobby then cheated on her with Kitty, Ellen Page's (as they were known at the time) portrayal of Kitty Pryde was kind of lacklustre, however that could be because the narrative role as basically the other woman was in direct contrast to how they tried to play Kitty as innocent. At worst it makes the character look manipulative.