I've been watching this with dd and saying "oooh look, it's wotsisface"! every couple of seconds. I think this is partly why I like the programme so much.
Such great acting. So many familiar faces:
Becky from Corrie.
Hayley from Corrie.
James Norton from War and Peace, Grantchester.
Ramon Tikaram from This Life (showing my age now).
George Costigan from Rita, Sue and Bob Too, together with Siobhan Finneran.
Racquel from Corrie!
The love interest, Neil, has been in something too. Fab voice.
Wassisname (John) from Downton.
Sally Lindsey (series 1) from Corrie.
Amelia Bullmore (Corrie-Des Barnes' wife).
I'm beginning to agree about Catherine's mumbling. I thought it was the sound quality at first. And, yes, she should smarten up. She's not even 50. Like a pp said, she's got plenty of help with Ryan and any working woman who can get back in time to pick up a child from school is pretty lucky in my experience.
On the point of Ryan, something has been bothering me. In series 1, Ryan was allowed to come home from school on his bike. At the time, Tommy was at large. I find it strange that Ryan was allowed to be alone when it was known that Tommy was around and had already made attempts to befriend Ryan. I remember Claire saying to Catherine: " he wasn't back by 5 like I told him to" or some such. Now if school finished at 3.15, allowing a boy such freedom when his murderous father is likely to be on the lookout for him was a bit strange, wasn't it?.
Yet in this series, when Ryan is older, Catherine is asking Daniel to take Ryan to school for her. Ryan is now 10, and Tommy is safely behind bars. 
I'm glad I'm not the only one who doesn't get James Norton. I think his looks are utterly repulsive. I like his acting, though; he'll forever be Tommy Lee, no matter what else he does. In my eyes anyway.
I think the programme is great, and the best thing on since Wolf Hall. It has a great sense of place; I like the fact that the locations are used to such great effect. It makes me want to go there! In fact, I spent a good few hours minutes Googlemapping the area yesterday. Any gransnetters out there who know the area?