I think Siege in general is fun, but I have some feedback too.
First: I have gotten 40/42 matches right now in EA, and more before in beta, playing siege, and only during this EA and 40~ games I have played Vlandia only twice. 2 times, out of 40+. Almost every damn game the teams consists of either Khuzait, Aserai, or Empire/Sturgia.
The absolute most common teams are Khuzait and Aserai, often times even playing Khuzait vs Khuzait or Aserai vs Aserai. I feel something is wrong and that Vlandia, Battania and such very rarely gets played.
Second: quite often the servers crash, sometimes many games in a row, anywhere from during warm up phase up until the last minute even. You never know.
I believe battering rams and siege towers are a bit fragile. They die quite easily.
I feel there are too many damn horses especially during late stages of Siege, maybe some kind of limit could be good.
I feel the sneaking-through-the-back-and-capture-G should be prohibited. Not only because it is damn lame and we all play to play not to have a 2 minute running and game over, but also because the defenders can almost never actually defend that flag in question.
Depending on the map, you might be locked outside and cannot get to that flag - at least not at all in time. That's just bullcrap gameplay.
Then we have another issue which is you cannot respawn manually or "suicide" so to speak. You can get stuck in this game, and you might want to be able to unstuck by dying, or simply respawn. You also want to do this if someone actually did sneak to the G flag and you cannot at all get there in time in any reasonable way (it's 1.30 min into the game, should the game really be over now?).
I think shields are in a good place in general, might even be a tad bit easy to kill sometimes with axes. What I want to say is do not nerf them. They need to be durable, and take arrows during a slow advance. Right now they can actually do that.
Localized VOIP would be so neat. There are quite mature audiences out there and I think Bannerlord easily can be and become one. A lot of players are older, and if you let us talk in game we'll set the norm.
I do not endorse ping systems. They take up the screen, destroy immersion, and have no place in this kind of game in my viewpoint.
Other than that I cannot say much more right now. Obviously we all want bigger Siege battles with 200+ men all humans, and obviously we want more freedom in the choice of equipment, but that you already know.
Edit: and friendly fire would be a great addition, if I didn't say it already.