I saw this infographic courtesy of DestinyDB and thought it was pretty cool:
Also, see that graphic with how many guardians there are at the various levels? I'm not sure when this was taken but there are only 177 people at lvl 25. I'm at lvl 26 and almost 27, they didn't even make a graphic for us. That's pretty cool. I must be in the small minority (although it will probably quickly become a majority). Nonetheless I find it cool to see stuff like this.