I hadn't read any of the previews or seen any of the trailers so went into this not knowing what to expect.
I do think that having such a big and strong cast doesn't necessarily improve this show. Phil Glenister seems completely miscast and there isn't enough for the likes of Jo Scanlan to do. David Walliams simply does a Frankie Howerd impersonation of course.
This is obviously intended to be broad (apparently next week's episode is much broader still) and the characters are not believable. This would be ok if the show was genuinely funny but the script was so-so.
I will give it another go next week though as it wasn't terrible.