I can understand the wanting to see the movie before it comes out, especially if it's one you've been waiting for for ages, but ruining the wait by seeing a half made version seems like a waste of time,and people should learn a bit of patiences anyway.

Just think if you'd put a year or two out of your own life into working on a film only for a pirate version to come out and the scene you've just spent the past couple of months working on, and haven't even finished yet, isn't even in it!
Or looks crap as it's not made the final production stages yet!

Watching it after you've seen the proper version would be understandable, for whatever reason, be it to see the pre-vis or just out of curiosity, but they usually put that kind of stuff on the extras anyway and it'll be a better quality too so why bother.

When it comes to anything Marvel all that goes out the window, I've been a Marvel fan for a long time and I'll always give them the respect I think they deserve by paying my money to see it. Infact I'll do that with all films, even the crap ones as I wouldn't want it happening to something I worked on.
Treat others how you'd like to be treated.