Personally, I think this will be part of the problem.
In the previous look, there was virtually no mention of ITV in the titles or the programme. Hence, I believe that the general public thought of News at Ten as an ITN production (rather than an ITV production) which I would argue has much more authority in the public eye. Now, they've plastered ITV all over it, which I think is considered by many as an inferior news service.
Technically I know ITN run all bulletins the same, but the News at Ten previous look rang more ITN than ITV. That's why I think this move is a mistake.
Take what you want from this as it's just my opinion.
We have a winner. News at Ten felt different precisely because of the lack of ITV. Now that NAT is plain crappy old ITV News, it has lost what made it special.
Also, with regard to the previous posts about uniformness of brand, will these TV companies / marketing types give viewers some credit. Persil change the soap powder packets every 3 months, but people still seem to find it. ITV News does not have to be uniform at all. Heck, Sky even has two Sky logos, and that has never caused them any trouble.
The other thing ITV execs should bear in mind is that "ITV" does not have the brand credibility of "BBC". Indeed, ITV is often seen as rather trashy of late, and seems to not be something to be proud of. The fact that NAT did not say ITV was in its favour. It is sad that ITN was replaced by ITV, but, give the direction the bulletins have gone, perhaps execs at ITN are happy about that.