In my opinion, Ethereum is a good investment. Right now, it’s the leading platform for decentralized applications (dapps) with the majority of ICOs using it as their foundation.
Although it has some scalability issues, it’s clear that the development community is working hard to solve them as efficiently as possible. It also helps that Ethereum has one of the largest (if not the largest) development communities out there.
As far as cryptocurrency investments go, it’s commonly seen as one of the safest and most stable coins. As always, though, you should do your own research and never invest more than you’re willing to lose.