Since moving to Channel 5, Celeb BB has basically been consistently on point. CBB8 however was a dreadful, dreadful series and happens to be the only series of BBUK I have switched off. CBB11 was pretty poor as well and CBB15 was exhausting to get through at times thanks to the worlds worst human Perez.
Every single other series though has been great IMO and I'm finding it increasingly hard to differentiate between which ones I love more with each passing series. 13 was my favourite until 14 happened, which was my favourite until 16 happened, which was my favourite until this series really took off.
Basically, they have CBB down to the tee. They just need to work on making the normal BB not complete tripe again. They managed it with BB13 and BB14 but for some reason since then seem intent on making it increasingly crap which is a shame.