First off ignore IGN's review of this game they have no idea what they're talking about. For them to think GH5 is better than Warriors of Rock (WOR for short) I will never understand.
Sound: Off the charts
WOR's set list is much better than GH5, come on it's got Ozzy and Metallica performing Paranoid, Tesla, Black Sabbath, Def Leppard, & Megadeth to name just a few. The setlist is easily one of their best in my book GH:M is my favorite but this is a very close 2nd.
Quest mode: 10
At first I was skeptical of it and thought it was over the top along with the charatecters Warrior versions. But actually it's a very fun change and enjoyed it far more than GH5's carrier.
It was the only reason I even put the GH5 disc in my PS3. WOR is pretty much the same which I still think could use some better metal tones but an happy it the same as GH5, now I don't have to torture my PS3 with that game anymore so that's a plus.
It's directly tied intro GH5 and Band Hero which is nice to a point... It's still like grass that never gets mowed, 97% of it is 10 second single instrument can't beat this or impossible that. I really wish they would add a "Remove It" feature so songs like that would be kicked off.
Lasting Appeal: Also off the charts
I can easily see myself playing this game every single day, 90% of the songs are enjoyable which is the least I can say about GH5 (had only 3 songs).
If you like Rock, Heavy Metal, songs that will actually test your skills, and a change from the same ol' same ol' carrier then this is a must buy or a least rent.
If you like easy to play pop, alternative and everything apart from what Guitar Hero stands for then go play GH5.