I think the main "criticism" the stadium has received has been that internally it is fairly basic (compared to the likes of NWHL etc). Tbf, it is. Two tiers on all sides, with the lower tier raised on the south stand to give the impression/illusion of a large single tier home end, by use of the super-riser. Spurs did similar with their South Stand, but less conspicuosly, with the dividing rail rather than a solid wall/balcony. That said, I think the wrap around upper tier at BMD is far more effective than that at Spurs, but only wish we had filled more of that void space under the roof at that end, by adding another 15+rows to increase capacity, and really make that end stand out, as 60 rows is not really that remarkable for this type of stand. That would've required a slight adjustment of the roof trusses, but easily achievable. As you say, it would've also been nice for the east stand to be 3 tier (as it was in the original drafts), with a full corporate middle tier and more boxes to really add exclusivity and therefore value to those areas.
To navigate the various planning and heritage minefields, there has possibly been a far greater onus placed on the externals and certainly the conservation efforts, than would've been the case at any other site. I think it is fair to say that that additional cost plus the very high site preparation costs, has probably influenced the design strategy for the seated bowl. Of course the club will probably say it hasn't.
That simplicity is not necessarily a bad thing in terms of aesthetics or function... as they say, sometimes less is indeed more. Hopefully, the format chosen will give a greater effect of unity and acoustics than at the other modern stadia in the league.