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.
They made some improvements with the new quest features. Overall though it is the same old game. I personally getting tired of having to play all the bad tracks to get to the good ones. Maybe I am just getting old, but I don't feel the game stays true to rock. Too many songs that don't make me want to sing along or even bob my head to.