Ripple is the bad one and Ethereum is not good as many people thought of. It is not completely wrong to say Ethereum is used by scammers as their very favorite tool to create their scam projects, then steal funds from investors. Such abuse brings adverse effects back to Ethereum price, keep it at low for a long time (high fee, abuse from scammers).
ICO, IEO, then DeFi this year. I also see a shooting star that tries to replace or at least repeat what Ethereum has, and has been used more popularly by scammers, TRON. Who can forget the lunch of Justin Sun?

ETH being a good or bad "investment" is still heavily debatable imo, even though I personally don't hold any. It still sucks in it's current state but it
could change(though I'm not betting that it will).
As for Ethereum being used for scams, I don't think it's a good argument to be against Ethereum; as people would always abuse the fact that anyone could build stuff on Ethereum, just like how people abuse the pseudo-anonymity of Bitcoin.
As for XRP though..