The Beatles Rock Band is one of the greatest video games ever made. And I don't just mean that sort of vague general praise kind of way. I'm talking top 10 of last gen. Top 100 of all time. It deserved much better than it got.
Now THIS is what I call a controversial positive take. What made it so good for you?
I'm not going to speak for this guy but I do share his opinion and I can explain why I think so.
Its creation in and of itself is pretty much a miracle considering all of the licensing of music, locations, likenesses, etc. that had to be done as well as historical accuracy (to the best of their ability). The visuals are nothing short of peak "Video games are art" considering all of the dreamscape sequences and opening and ending animations. The music, while not all encompassing, reflects the breadth of variety of the most influential rock band of all time and gives the player a new appreciation of their catalog. They were able to include screenshots and videos from their touring days, they added never-before-heard filler dialogue from the recording sessions to the beginning of each song (some specific to the song itself), and they introduced a way to harmonize with two other vocalists that was the greatest addition to music games as a whole IMO.
And this game could have only really happened at that specific point in time where music games were all the rage, the licenses to the Beatles' music catalog were the in the right hands, the technology was advanced enough to separate the original master tracks into separate instruments (which because the masters were on tape had to be done digitally and manually), AND the two people that made this happen just happen to be in the right place at the right time (Dhani Harrison, son of George Harrison, and the head of MTV Games at the time). The two living members, Paul and Ringo, as well as Yoko Ono and Dhani were extremely involved in the development and made sure that the game represented the band properly as best as they could. They even "finished" one of the unfinished songs in Abbey Road and included multiple enhancements to the arrangements to the songs that before the remastered Beatles albums came out, the game's masters were essentially the best way to experience their music.
So while to some it may just be another rhythm game, for the others it was an experience akin to discovering music for the first time. And because of that I believe it should be considered among the best games of all time.
EDIT: Also I forgot to mention the instruments themselves which were modeled after the band's own instruments which enhanced the immersion of playing their music.