New here!
Here are some of my metal and hard rock recommendations; I listed their GENERALLY RECOGNIZED genres in parentheses - these may or may not be the genres that some people would think of them as:

Slipknot (alt metal, nu metal)
System Of A Down (alt metal)
Taproot (nu metal)
Avenged Sevenfold (uh so many genres depending on the album XD)
Rammstein (industrial metal)
Disturbed (heavy metal, nu metal)
Arch Enemy (melodic death metal, thrash)
Of Mice & Men (metalcore, no hate)
Chevelle (post-grunge, alt metal)
Breaking Benjamin (post-hardcore, post-grunge)
Bring Me the Horizon (metalcore)
Pantera (so many genres too...)
Pierce the Veil (post-hardcore)
Five Finger Death Punch (groove metal)


UPDATE: Some more I've taken a huge, huge liking to, among others:
Absu (black/death metal)
Napalm Death (grindcore)
Cerebral Bore (black/death metal) - my FAVE!

bolt thrower - massively under-rated

sons of odin, manowar

sole survivor, helloween

battle beast ,kingdom

Sorry it's not much to go by but anything that sounds like these would be great.

Especially the helloween one.

i love pierce the veil! i've never taken the time to listen to asking alexandria though.

My Rock and Metal Recommendations are as follows:

Rush
Iron Maiden
Black Sabbath (Ozzy Osbourne)
Black Sabbath (Ronnie James Dio)
Dio
Rainbow
Triumph
Led Zeppelin

btw, gotta love this song....

Best double album. Ever.

Exile on Main St. a close second.

Actually, not very close.

Um...

http://ecx.images-amazon.com/images/I/51sBFJYnq6L.jpg

Just shut up.

Had to remind you of your fave, sorry mate.