I probably won't bother reviewing DLC previous to this, but I'll review what comes out in the future - or try to.
Hammerhead: 4.25/5 Great song to listen to, not amazing on guitar - actually pretty easy, but difficult on drums. I beat it after a few tries, and it is one unique and fun chart, but it's not spectacular. I'd say it's worth downloading, though.
Rock 'N' Roll Dream: 4.25/5 Only a buck, and it's worth it. Not a hard song by any means on drums or guitar ( Although the second solo is a bit tricky ) but it's well worth purchasing. The drums are an easy 100% on Expert, but just a lot of fun, and it's a great song, too.
Afterlife: 4.5/5 The one with the "impossible solo". Afterlife is quite challenging to the average Expert player on guitar - does that make sense? The solo will give many people fits if they don't know when to use their Overdrive. Most decent Expert players will probably average anywhere between 40-60% on this solo - so you had better have Overdrive. On drums, the quickquickquick double bass isn't troubled, but a lot of it is. Great song.
Critical Acclaim: 4.5/5 I really disliked this song at first, but it's amazing on guitar especially. The song is quite easy to FC if you can get the solo down, which is NOTHING compared to Afterlife's. The drums are also fun. Both A7X songs are worth downloading whether your a guitar or drum player. And, if you play both, it's even more of a better value.
This weeks DLC gets a 4.5/5