Abysmal, it's just a little different. It's a little worse given you don't get the card draw, obviously, but the 2/2 body makes it slightly better vs pings or fan of knives etc.
I could make a detailed post about the Oil Shell, which is like 22 or so cards, and ~8 cards that are totally reasonable subs. Kobold is one of them.
Kreme, it's hard to say. I like the decklists that I use most
Maybe I'll just make a big post or something, but a lot has been written elsewhere by people who are also really good at rogue