The worst I heard was on The Ringer's recent NBA podcast with Chris Ryan, Kevin O'Connor, etc. just yesterday. They opened with "what would have happened if the Thunder were in the East?" and basically came to the insanely stupid conclusion that the Thunder would have beaten the Celtics. And I hope KOC reads this post.
These are the same people who all picked the Sixers to beat the Celtics in 5 or 6 games because the Sixers were "the best team in the East". But after the fact it was that the Bucks or Sixers lost. And now it's that Lebron is tired from too many games and his supporting cast is "trash". Sorry, but Kevin Love was an all-star, they have plenty of other good (and high priced) players, and were considered Eastern conference favorites opening the season.
How would the Thunder have fared against the Raptors? Probably not very well... and the Raptors were SWEPT by the Cavs. "Lebron beat the Raptors" was the headline, not that the Raptors were better but lost it. The Celtics have won 3 games against that same Cavs team.
How about this Chris Ryan & KOC - The Celtics were 22 and 8 against the Western Conference during the regular season, a 73% win rate. The Thunder were 28 and 24, 54%. There's your regular season answer. And in the post-season the Celtics have been even better.