When I first starting watching this show back in the 90s when it was on BBC2 I really did think that Jerry was a full-on anti-hero douchebag type on purpose. I didn't know anyone of that age who wore white trainers, had 60 boxes of cereal and a Formula 1 car poster on the wall. Plus he's always smiling when people are stressed and miserable, and his stand-up bits are the weakest part of the show.
Then I found out that I was simply watching Jerry Seinfeld.
I'll agree that the first two seasons are ropey, but for me season 3 is when the quality (and the budget) notably increase. My American wife was a fan from the early days and she remembers season 3 being the breakout season in terms of viewership which greatly affected the budgets and stories in season 4, when Kramer starts getting A plot lines.