Depends on what the format or story is. I loved the majority of the first one, but hated Magma and the story associated with her. I would love it if you got to go 1) enjoy a fresh story that allows you to unlock fan favorites and franchise standards and 2)relive so many of the amazing storylines from the past with those characters as you unlock them with new content coming out over time(not a full list but an idea):
Giant-Size X-Men (with some shadowy characters that either through a DLC or an unlock Deadly Genesis plays out and interacts with it in a different level)
DPS
DoFP
Inferno (complete with Excalibur and NM)
Xtinction Agenda
Age of Apocalypse
Phalanx Covenant
Second Coming
AvX
etc