Teamfight Tactics is too much RNG.
If you are lucky you are basically a winner. It's like coin flip. Sometimes you can get up to 4 items from raptors and sometimes you can get literally nothing... It shouldn't be a luck based game mode... Don't get me wrong. I like the game mode but there is no fun when you lose because you have 0 items or you can't get ONE Vayne to get her to tier 3 and you reroll like 20 times but you can't find her... It's like a lottery.
PS. There should be like this Hextech no luck protection thing with champions you get after reroll. Each time the chance of getting the most needed champion and like the minimum amount of items you can get each "items stage".
For instance: 1st items stage: at least 1 item. 2nd items stage: at least 2 items. etc.