Pros
Honestly it's highly dependent on what ride you work and who you're with. It can be rewarding, you could have a strong team that gets things done and has fun, and you could have great management that supports you. If you're interested in how rides work, this job will show you awesome things that other people don't get to see.
Cons
This job is so dependent on how everyone works as a team that having a group of unmotivated negative people can really affect your work day. Some managers don't see you as people and are never there when you need them. Guests can be extremely rude and the work (depending where you are) can be extremely physically exhausting. It's very difficult to move up through attractions. You have to stay on your toes because part of your job is keeping people safe, and making operational mistakes can quickly cost you your job. My advice is to avoid working in attractions for too long; my first year was amazing but things started to go downhill the longer I've been working here.