Hello everyone!
I'm Anubhav here, and I used to main Mundo. I like him alot, and I'm still playing him sometimes. He is my favorite, and he can't be countered by melee champion so easily. He is the most annoying champion because of his ult! I hope you spend time to read all the things. I'm still working on some more things so please be patient and keep checking this guide often! I will pray that you will be a better Dr.Mundo! If you find something wrong, please comment. I will try to fix it as soon as possible.

Pros

1. He is very tanky.
2. He hardly dies or goes out hp due to his passive.
3. His ult is annoying, and very awesome.
4. Easy escapes after level 6.

Cons

1. A little weak early game.
2. Kind of squishy without items.
3. Vayne easily destroys Mundo.
4. He doesn't deal alot of damage, but does reasonable damage!

You'll need to farm, since you are not going to get any double/triple in most situations. You will need to last hit minions using Q for HP. Even if you target it at a champion, try to aim to that it will atleast hit a minion ( so that you won't waste that Q ). Q heals when you kill someone with Q. Last hitting minions is a great trick. At late-game your passive is most usefull when you have your build done. It's not so costly, so you should be able to get between mid and end-game. You just need to maintain your farm level!