Not in love with the show at all, and definitely a weak showing over the first two episodes.
The whole dual personality thing is really grating as a device, made all the worse by the poor Frank Spencer style english accent.
The CGI is pretty wonky and the creatures being invisible to everyone but Marc/Steven is lame, it makes each scene feel "more CGI" as everyone is reacting to nothing. There is no weight to the creatures either it just feels so fake, with zero stakes.
So far they have given us zero reason to care about this character, by making Steven annoying we as the viewer empathise less with whats going on. We are two episodes in and don't understand the stakes at all. Wandervision suffered from this but at least it had a mystery to unravel with characters we cared about. It could afford to play with the audience because they had already done the heavy lifting. Here we know nothing, aside that we spend 99% of our time with annoying Steven also clueless. It might be a fun thought experiment. But it isn't entertaining to watch.
On the plus side Ethan Hawke is doing the best he can with "generic bad guy who doesn't want to hurt anyone, but totally hurts everyone because evil reasons" role.