First off, you HAVE to do this build in ranked games, if you do it in normal games i cannot account for any diseases or aids that may happen to you from getting too many *****es with your crittlestick swag. That being said, if you just want to have some fun in LoL, then go crittlesticks. However, there is more to crittlesticks than just the build.

You MUST be extremely obnoxious in game, otherwise you will not have the maximum amount of fun. My advice is to do this on a smurf. Because repeated use of crittlesticks will result in too much awesome and therefore you will be banned. Scream things like:
"I AM CRITTLESTICKS LET ME PENTA YOU"
"Are we winning? I think we're winning!"
"GG NOOBS I CARRY I AM CRITTLESTICKS"
"CRITTLESTICKS TO THE RESCUE"
or any variation of these quotes.

As you are in the jungle, you will not have any lane opponents. Therefore, if you are actually trying to find advice on lane opponents in the jungle, you must not be very good at this game. If you do (for some weird reason) play crittlesticks in lane, just assume that you are royally ****ed against every single opponent. You can only be pleasantly surprised.

Your goal in teamfights is to just run around as much as humanly possible and cause chaos. Even though your goal is to cause chaos on the enemy team your random skillspamming and screaming in chat will most likely cause chaos on YOUR team. This can be fixed by yelling and running around more.

Now for the most important rule on crittlesticks:

ALWAYS FOCUS THE TANK. IF YOU DO NOT FOCUS THE TANK, THEN YOUR CRIT WILL NOT HAVE MAXIMUM EFFECT.

as long as you focus the tank, you will win all of your games.

You will be seen as a saint by the LoL community. You are after all the one that is constantly giving them ELO. This will get you free RP and skins if the gifting system is up. Make sure to report the teammates that are doing the best, as they are (of course) stealing all of your kills.

Have fun playing Crittlesticks!