- Angst? What Angst?: Jimmy Hudson is surprisingly cool about the idea of having basically lost everyone he ever knew, by being in another universe. He doesn't have any qualms about working with Magneto either (don't forget that, in the Ultimate universe, Magneto was way more evil and ruthless than mainstream Magneto ever was). Justified in that he has amnesia. Eventually averted once he gets his memories back.
- Awesome Art: This was the series in which R.B. Silva established himself as one of the great X-Men artists.
- Base-Breaking Character: The reveal in issue 1 of Blue that Jimmy Hudson has crossed over into the main Marvel universe from Ultimate has stirred debate among the fans. Particularly questions over the fact he's joining an increasingly crowded number of much more popular Wolverine-type characters. X-23 fans particularly are frustrated, as despite being the current Wolverine of the main Marvel 'verse she's currently locked out of any team book appearances.
- X-Men Red eventually fixed that last complaint.
- Unexpected Character: No one expected Jimmy Hudson, Ultimate Quicksilver, Ultimate Armor, Guardian and Mach II to turn up. Same for Bloodstorm from Mutant X.
YMMV / X-Men: Blue