I've heard from tons of people that Halloweekends are the worst time to go, unless you really, really, really want to do the haunts. Operations there are phenomenal, but waits can still get pretty long. I really hate a day at a park when every single wait time is over 45 minutes.
I think it comes down to how much time you'd have. If you only have a day, I don't know if it would be worth it for what you'd be able to get done.
I did not care for Maverick. It was like I305 without the drop. The only rides there that I wanted to bring home with me were Millennium Force and Blue Streak. Dragster > Ka, but they're both kind of once-is-enough.