I honestly think it's the abysmal production that stops any C5 series toppling the golden era for me. There's been casts in the last few years that I'd say were better a a group than 7 for sure, but what the latter had going for it was a slick, professional production team, with creative tasks, innovative and perfectly executed twists, and not the tacky, incompetent, mistake-laden mess we have now

I judge a series as a whole package
Mind you, BB17 came very close to becoming my third favourite series. Had Hughie, Andy or Jackson won, it would've toppled BB10 and been under 6 and 7 respectively. Alas Jason won and now I still debate whether I prefer it to 15 or not. It came so close