First of all, disregard that 4-dot rating. If this is 4-dot, then Cherub Rock should be Painkiller-level hard.
The song, for the most part, is a chordfest. It's basically 4 minutes of straight up chord strumming. Does that mean it's bad? Well, your mileage may vary, but I like it.
As stated before, it's a chordfest. But, it's a comfortably paced chordfest, so there is no need for alt-strumming. Next, the way the chords are arranged are a bit strange, forcing you to shift your hand over the fretboard constantly from going to green chords to orange chords very frequently.
During the chorus, you get a different flavor of chords that are of a more basic variety. Still, you get a couple of single notes and HOPOs in there too.
There's also a part where the singer is singing "Nothing's for freeeeeeee." This part is notable because of its 3-note chords, need for occasional alt-strumming, and random 2-note trills at the end of the part.
The main reason why this chordfest, despite repetitive, is so fun is because of how you NEED to move your hand up and down the neck to shift from green to orange almost every second. Plus, the occasional HOPO and 3-note chord section offers a little variety on the pattern.
It's definitely NOT the best chart with its repetitiveness and it's failure to be a true 4-dot tier, but it's definitely a chart you should check out. Even then, the other instruments (minus keys) are also pretty fun.