@Herr_Kommandant I've never read this series with the expectations of it maintaining historical accuracy, frankly I never expect fiction to be historically accurate or even remotely realistic (Thorkell's many absurd feats of strength in the prologue arc alone, along with dual-knife-wielding child soldier Thorfinn, killed any potential sense of realism from the get go). For me Vinland Saga has always been a character-driven narrative, experiencing Thorfinn's growth as a character over the years, alongside the stories of other cast members is where I find much of the enjoyment.
You may not like Hild (crossbow woman), but to me she's a crucial character, since she is Thorfinn's own monster, much as Thorfinn was Askeladd's. Also, Cordelia (the slave originally introduced as Halvor) isn't a man pretending to be a woman, she was born a man, but raised as a woman to protect herself from her father (likely Thorkell from the backstory we were given), and grew to identify herself as a woman (in other words, she is trans).
Sigurd and co hiding in barrels is also pretty fitting given how Sigurd was largely treated as a gag character, yes he has a proper character arc, but most of his screentime was spent on gags, so him finding a stupid but in-universe effective means of staying safe was completely in-line with his portrayal.
It definitely seems like your expectations were far different from what you received, but I would never claim that this series got any less historically accurate, since its historical setting was mostly used to insert famous cameos and ground the story's narrative in order to cut down on exposition.