What kind of crossover do you prefer?
I've been reading old Hulk comics and for the Secret Wars and Infinity Gauntlet events Hulk will have one issue that ends with him literally walking through a portal to join the crossover event and then the next issue is him walking back out and continuing whatever plotline he was in the middle of.
More recent stuff I have read will have the series getting a tag on the covers for a few issues that focus on their part in the event.
I prefer the old way. Maybe I've just been unlikely and it works most of the time but I feel like the new way can derail whatever story the series is trying to tell.