I like the show a lot more after four eps, although this is largely down to the introduction of some more likable characters such as the head instructor and Sasha. Eren is obviously a bit of a straight-forward lead character at this point, and Mikasa - for all that they have done with her appearance during the time interval so far - is still not well developed enough either.
On one hand it feels like the show is flying along almost off the rails with the timeline shifting so suddenly, on the other hand it really feels like they need to get to a point where we are given some more significant information about what is going on. The existence of the Titans themselves is not easy to rationalize even from the in-world perspective that we have so far, I would be most interested is skipping aggressively backwards in time as well as forwards to give us a bit more to speculate on as to their origins.