So, am I supposed to like Erina? Because she's the worst but it almost feels like she's being set up as the main girl rather than a villain.
Honestly it's almost getting in the way of taking the whole hierarchy seriously. Everyone treats her like a big deal but Soma's already shown that he's better than her, and she knows that and is just ignoring it. I know this isn't exactly a serious show but they need to hurry up and have her lose before anyone else can actually come across as a threat, because seeing everyone bow down to someone the mc beat (in a sense) without even trying is kind of unintentionally hilarious.
No he hasn't shown yet that he is better. He has only shown that he is able to cook good.
You are also not supposed to like her if you don't like Tsun Tsun characters. She gets cute later on in the manga.