I think it will be an overwhelming wave of YABU based on how popular it is, but I just don't get the Bluey hype.
I was oblivious to it for years but lots of people were raving about it so I put it on one day for my 3 year old. We were both a bit bamboozled. He couldn't sit through an episode and wandered off. I found it very irritating- loud, whiny voices, irritating characters. One episode had the dad doing a mad sock puppet thing and the other episode was about kids on FaceTime. It was utter chaos and my son was nonplussed. I think because it was so chaotic and without any story to it. I find the colours really bland too.
It seems to be a hit with parents first, who put it on because of all the jokes they can appreciate that are over the kids' heads.
My son loves The Moomins, Postman Pat, all of the Julie Donaldson animations, The Wombles, Fireman Sam, Pingu, Thomas the Tank Engine and so on. He seems to really enjoy programmes that were made with real models in particular and these just seem so much more well made than Bluey, and have a gentler feel and better storytelling.