Well if I'm being honest I read these books because the worlds are interesting, none of the characters were ever particularly interesting. Rudi least of all since everything around him seemed to be just so badly contrived, such as all politics instantly becoming good for him or everyone liking him and no one really seriously objecting to his rule.
Yeah the bold there is the biggest thing that bugs me. There is zero tension in these novels and no character drama/growth.
It's the "secondary" characters that have (along with the world building, which is Stirling's real selling point as an author) really made the series.
To the point where "Oh, another Rudi-chapter!" begins to grate, badly. The second Rudi steps back into the narrative, all the other characters suddenly lose their agency and drop what they are doing to remark on how beautiful/smart/strong/capable Rudi is.
If Rudi was written in the same way, say, Sauron was written....primarily as an offscreen entity, with the other characters simply hearing about his doings, at one remove....things would be a lot better. As it is, he's basically a literary "Poochy" (the Simpson's fans will understand).
As a primary character, he just doesn't work, and drags the narrative down by steamrolling every situation with sheer (informed) awesomeness.
- He's not as good an Archer as Edain, but he's a close second.....and he's better at everything else than Edain will ever be.
- Somehow, he's a better Knight than all the PPA knights who are knights 24/7/365.
- Somehow, he's qualified to command the entire Montivalan army...despite having almost no military operational experience...and in spite of the fact that there are a dozen people on hand who do have lots of experience wrangling armies.
- Somehow, he's the best swordsman ever. Despite not having "swordsman" as his primary occupation (which was "trainee Clan Leader").
- IOW, Rudi can get 36 hours of learning/training out of a 24 hour day.
King Arthur works as a character. Lancelot works as a character. Galahad works as a character. A single character with all the abilities/qualities of Arthur, Lancelot, and Galahad combined.....is painful to read.