Trinity Force's Crit
Don't bombard me with dislikes because I'm not happy with one item-nerf.
But the Trinity Force was a really good item choice the way it was, with its 20% crit. It gave champions who relied on crit more variety to their builds than just the Infinity Edge and Essence Reaver. Not every champ needs the Essence Reaver. Now it's just been turned into the new Zephyr, with less movement speed and no tenacity.
The Trinity Force was given that name because it had a little bit of everything for everyone. Taking away the AP was sad, but not really missed; but now with no crit and more CDR, it's slowly on its way to becoming a standard item that only one type of champion will use: Jax.
Before its nerf, it had many good uses. I used him on a full-crit Talon build, that could prick enemies off before they could say "." Now, it's just an 80% build, because Talon doesn't need the Essence Reaver. And Garen? You haven't seen Garen until he went storming in with his 40% crit from IE and TF, slaughtering everything that bleeds, cracks or disintegrates. But now those types of game styles are no more.
If anything, League needs a new item that implements Sheen and 20% crit. Maybe the Sheen can deal 125-150% base damage, but can crit. That would be really cool and beneficial to the full-crit assassins that were left in the dust not too long ago.
Bruiser 
. Hitting hard faster with lower cooldowns to spam Spellblade is far better then relying on RNG crits for these and other champions, as they wouldn't build crit anyways. As I see it, it's just riot returning TriForce to its original users.
and 
just did more damage than good for those few champs that depended on it for their builds, I used to get 
and damn it did wonders on him, instead of being just an ice dispenser I could land hard blows on the enemy and land crits as well, and having ap at the same time.