I'm actually a big fan of crossovers. I like big stories where all the heroes team-up or deal with a threat mostly associated with one character. I think even a lot of the events that have terrible reputations, have moments that I've enjoyed. Axis, which is....really quite bad...still has a few things to enjoy about it. I like the moment where Magneto arrives with all the villains to fight Red Skull and I think the Deadpool/Apocalypse moments are effective. But obviously it's a mess.
Which of the following events do you find to be the worst? I know this is a very subjective question so I am probably failing to include some that others would put on the list. But these are the ones I considered to be the greatest failures (I used Wikipedia's article on Marvel crossovers to help define what counted). I also didn't put things like Shadowland and Maximum Clonage that were incredibly character specific and did not feature as many tie-ins. So the list I compiled is:
Secret Wars 2
Onslaught
Age of Ultron
Fear Itself
Avengers Vs. X-Men
Axis
Civil War 2
Secret Empire
If I had to rank them, worst to least worst I think I would go with:
1. Secret Wars 2 -
2. Age of Ultron
3. Civil War 2
4. Secret Empire
5. Axis
6. Onslaught
7. Avengers Vs. X-Men
8. Fear Itself (I actually kind of like Fear Itself)