Honest to god I don't get it. Even with the EA, contained content we got (and specially because of that), you can perceive growth in Shadowheart, for example (since everyone complains mostly about her cause she ain't no waifu).
Being able to see that small growth in EA is reassuring to me in that yes, the writing is nuanced, and I expect it to continue to be so, even if they are not the most companionable companions. Perhaps labelling her as a tsundere will prove more effective in convincing the masses. Point is, females having any depth that's not "cleric swoon *giggles*" is where majority of the complaints I saw seem to be coming from. And this from someone who absolutely detests Wyll and that frog Lae'zel and will not say no to a good himbo given the chance. I haven't been able to stand Wyll in my plays because of his casual arrogance, Lae'zal casual racism and arrogance (Lae compliments your character on their nerve after killing the goblin leaders though, which, hey, another sign of growth). Wyll.. I'd rather eat dwarf belly than have him in my party, honestly, but I see where he has potential and why people might like him as a character.
A dimensional companion you hate is infinitely preferable over blanks of characters that add nothing and just react with claps and praise. But, as with most other posts, this will end up being a battle of opinions.
Barring the fact that its EA and is incomplete, i'd honestly just give people time to warm up to the characters. In BG2 Viconia is one of the top waifus and she straight up insults your character after their first night for not "performing" up to her standards. I'd imagine that put off a lot of people initially before she became "one of the best romances in video game history". I don't want this warm up to take 20 years of course, but I am sure there will be more character development in these guys to make people love them.
I am kind of on the fence about Wyll, too nice is a little questionable for me, and yes as you said he is arrogant. But Lae'Zel I absolutely love and love the chance to trade insults with her.