We've only reviewed two Hisense TVs, the H9E Plus, and the H8C in 2017.
Overall, Hisense TVs have good picture quality at a low price. That makes them good value for most use cases. Don't expect a very seamless Smart OS however.
Hisense's lineup is mostly budget oriented. They're starting to introduce more high-end models, but the bulk of their TVs are aimed at the low-price market.
For 2018, Hisense updated most of their lineup, with higher-end models running Android TV 8.0, and most of the lineup supporting Amazon Alexa integration.
Hisense is a growing brand. They've shown to provide a competitive product in the mid-range sector and are looking to expand in other price ranges. Our sample is pretty small, but their TVs tend to be at feature parity with competing products that are quite often quite a lot more expensive. They aren't without flaws, however. Their smart system is a definite weakness compared to Samsung, TCL or Sony, although it has improved recently.