The Beatles Rock Band is definitively a must buy for all Beatles fans out there.
The game features 45 songs, all by The Beatles. The Beatles equals quality music (at least to me), so you know all songs are great but you will find yourself wondering why they left out so many great songs out (DLC anyone?). All of the songs are playable with all instruments.
The animations used for this game look good (nothing outstanding really) and add something to the atmosphere of the game. You'll see The Beatles playing at certain locations and some songs feature animations based on the song (my favorite one being "I am the Walrus").
The game features a story mode in which you must play a certain setlist, song by song, in order to progress. You can earn photos by 5-staring songs and if you 5-star all songs in a particular setlist, you'll unlock Challenge Mode.
Challenge mode doesn't do things much differently from story mode. The main difference is that you must play all the songs in the selected setlist continously (just stopping to load the song and animations).
After unlocking certain amounts of photos, you'll start unlocking videos. These videos show somewhat rare content from the band. Its a nice feature for those like me that feel nostalgia just from seeing 3D animations of The Beatles.
So, just a little recap here: If you consider yourself a Beatles fan, you just can't skip this game. While it doesn't innovate in any way, playing the good ol' Beatles songs is certainly entertaining. If you don't like The Beatles and music games in general, you're better off just skipping this.