The lights are on
Some people you battle on Wi-fi are cheap because they use people like Ike, Kirby, Marth or Wolf. These are easy ways to beat them.
First way: try to survive until the end of the battle without dying, then it will go to sudden death. When you get there, you will have a way easier chance of winnig.
Second way: use up all the items that appear so the opponent doesn't get an advantage.
Third way: If you are on a stage where a part of it can really damage your character, [Like the cannons on the Halberd], make sure your foe stands right in front of it.
This isn't really a guide. You just assume that a particular character is bad, ok, or good. You should back that up with a reason why they are bad ok or good, because guides are based on facts not opinions.
Interesting that you have Meta Knight, the highest tierd character in tournament rankings, ranked as bad with no explinaton as to why.