Oh, okay. Here are my votes:
BEST:
#1: That's a tough one, so I won't go for any on that, sorry.
#2: The best ending is probably Super Paper Mario. One thing I like about it is that unexpected plot twist.
#3: The game with the best powerups is probably Super Mario Bros. 3. It had a lot of them, and they were all fun to use.
#4: The best final boss battle is hard to decide, sorry. I won't go for that one.
#5: The best storyline is either between Paper Mario The Thousand Year Door and Super Paper Mario. I can't decide, so I'm not going to vote for that one, sorry.
#6: The best attacks are probably in Mario and Luigi Superstar Saga. They were funny and fun to perform, especially when you can do 3000+ damage (or around that. I don't remember my highest hit) with max stats using Spin Bros :).
#7: The best first boss is too hard to decide, so I won't vote on that sorry.
#8: The best intro is a little hard to decide too, since most of them are great in their own ways.
#9: I think the HUB in all of the Mario games are great, with a few exceptions, such as Mario Is Missing!. I'm not voting on this one, sorry.
#10: I can't really decide on my favorite first level, because all of them have great memories. I'm not voting on this one, sorry.
I'll only do a small WORST list because I really can't make up my mind.
#4: Mario Is Missing!. You're completely invincible against the last boss, and you can't lose. Also, he only moves back and forth across the castle.
#9: Mario Is Missing!. You're in a castle that is completely straight and you can open a few doors that each lead to 2 pipes. Each pipe takes you to a different part of the world. In each world you answer questions. It's not really that fun of a game to me.
I don't see why people think Flipside is the worst HUB out of all the Mario games. I thought that everything was placed in a great spot. It's easy to make your way around the town, and it has plenty of secrets in it.