DON'T PLAY RANKED

BEGINNING
At the beginning you can invade with your team and get teams's first blood.
(like all Blitzcrank main)

Lane Phase

Play with your adc and steel some kill if you want(if you are premade steel more kill)
(if the enemy team have annoying assassins build Immortal Shieldbow)
respect wizards and assassins

For a real fight (1 vs 1) wait to have at least 2 items ( Kraken Slayer and Stormrazor)

Mid Game
The Blitzcrank Full crit's secret is to don't use Ultimate and use R's passive to deal more damage.
You can win easy 1 vs 1 but dont go alone in the jungle if there is not vision.

End Game + Tips
If you play good and don't int u don't arrive at the end of the game.

If you arrive to 100% crit the secret is to grab and punch enemy with Power Fist
( Power Fist deals double aa damage, it + crit+ Essence Reaver passive deals a lot of damage and can one shot.

Youcan use your w for more attack speeds.

PRO

You can fight against big champions and melt tank
You can solo Drake
You have fast abilities
Enemies break out
+++Fun

CONS

You are easy to kill
Don't have escape
Your ADC can easy Tilt

DON'T PLAY RANKED

BEGINNING
At the beginning you can invade with your team and get teams's first blood.
(like all Blitzcrank main)

Lane Phase

Play with your adc and steel some kill if you want(if you are premade steel more kill)

At level 6 you can go mid for easy kill or assist

Mid Game
In the Mid Game (if you steel some kill in the early) you can do a lot of damage with combo Q+E+R(+elecctrocute)
You can win easy 1 vs 1 but dont go alone in the jungle if there is not vision.

End Game
At the end of game (if ypu not inting this one) your life is easy but some player can counter you with magic resistence: sell supp item and buy another ap item

PRO

You can easy kill enemy
You have fast abilities
Enemies break out
+++Fun

CONS

You are easy to kill
Don't have escape
Your ADC can easy Tilt