I liked it, but it does seem like it will struggle against its very different focus if it wants to contend with the popularity of GoT. The Dance of Dragons should be suitably epic though and I assume will be the second half of the season. I didn't have much doubt that Matt Smith would deliver and he did. Rhaenyra and Vicerys were well cast. Rhaenyra a cute. No complaints about production, etc.
As Wacky said, none of them are natural protagonists though. There is another actress playing Rhaenyra when she's older as well as one for Hightower so it looks like the show will time jump to the actual events of the civil war with different actresses (but not for Matt Smith presumably). so we don't even get to really spend much time with Alcock in the role anyway, so that might be slightly jarring. I assume that the season will end with the civil war concluding and Aegon III being put on the Iron Throne so is the show going to continue on from there with an entirely new cast for season 2?
It could work I guess. I'm a sucker for court intrigue but once again, prequel material always suffers from having the destination mapped out.
Also, it really felt that they were forcing the quota of violence, gore, and sex to make sure the audience knew it was still Game of Thrones OK. OK!
Anyway, I'll keep watching.