This started as a brilliant show about five single young adults: four nerdy male scientists and a slutty, uneducated waitress. This worked really well. However, the makers decided to ruin this unique and very entertaining formula and put all its main characters - apart from Raj - in long-term relationships. By doing that, they've turned a great new show into yet another mediocre, couples and families sitcom.
Bernadette is an intensely annoying, condescending, manipulative, patronising, bullying, arrogant battleaxe who falsely claims to be nice. She has ruined the humour that involves Howard by changing him from a desperate single guy trying to get laid into hen-pecked, downtrodden property of hers. She's like one bad joke repeated over and over again. She snipes at Howard frequently, despite knowing full well what he was like before they married. Melissa Rauch doesn't have Bernadette's horrible voice, so I don't know why she puts on such a painfully unpleasant voice to play her.
Amy's like a female version of Sheldon and hence is redundant.
Leonard and Penny aren't anywhere near as funny as a couple compared to how they were when they were both single.
I'd give this 9 before Bernadette was introduced and 3 afterwards. There are a lot more episodes that include her than don't - hence I've given it 5.
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