I read the comic yesterday, and I have mixed feelings about it. I think this is the first time that Emma's likeness has been closer than Steed's--usually artists can nail Patrick and resort to drawing some woman with a flippy hairdo for Emma. But if there are legal issues, that explains it--Patrick owns a piece of the rights to his likeness as Steed, and anyone who wants to merchandise it has to go through him. As far as I know, none of the other Avengers actors have the same rights, so they can draw Diana all they want (though it doesn't mean they'll do it very well--no one ever does), but they have to tread carefully when they do Patrick. (Although older Steed actually looked closer to older Patrick than younger Steed did to younger Patrick.
)
The art style was a bit sparse for my liking--a bit too much white space everywhere, with splashes of psychadelic colour. I'd rather they have gone for the full-on bright colours of season 5, or an almost-monochrome look like season 4, but then I like lots of colour in my comics, and I associate bright colours with the Emma era. It seemed quite short, too, but I think it's my history of reading 32-page stories that's affected my expectations of story-length.
They did a decent job of the dialogue, which is the biggest thing to nail when it comes to the Avengers. Not every line worked, but on average the voices sounded right. I also noticed this one was set in 1966, as opposed to 1969 as was advertised. I can only assume this is because it's a 0 issue, meaning it's a sort of prologue to the main storyline. Unless they decided to change it, in which case they won't have to worry about finding Tara something to do...
It's not a perfect debut, but then it would be a bit unreasonable to expect it to be. These things tend to get better over time as the people behind it settle into the characters. I'll be interested to see how it evolves.
(Oh, and sorry to hear you got hurt, Sinus!
Get better soon!)