Why is it awful? Seen it a few times, seems alright to me, not much more to it that her presenting the news.
The issue from what I can see is other than Erin saying 'Outfront' a lot it's not hugely different from any of the other hours. Whether it's Anderson's hour,Cuomo's show, Don Lemon, Erin or Wolf it all essentially feels the same content and constant talking heads - just the talking heads slightly change.
CNNI airing a few of those feels fair enough but the current situation where from 9pm UK time it's basically US output for 7 hours feels lazy (especially since as others have mentioned it's not like BBC News/World where the content is fairly like with like ). The Domestic output provides next to no international news.