Smash having a slow 1.1 APS does suck, but it does have some things that can make it a powerful Skill to use.

it has a Taunt that draws nearby enemies close to the Warrior so that it can get hammered. add +2 Multi Attack for more damage.

when you put Skill Points into Smash, it does more damage, has a chance to stun, increases the damage done by Critical Damage by a lot, and reduces the cost of casting Smash.

60+ Stat Points into Power and a high crit chance & crit damage are a must.

1.1 with +60% Attack Speed is 1.76 APS.

1.76 with Angelic Set (5) is 2.2 APS. this also gives +25% damage.

2.2 with Zealotry Set (5) is 2.75 APS. this also gives +25% movement Speed. +25% damage if you have a Shield equipped.

2.75 with Hunger Set (5) is 3.78 APS. but only when your MP is 75% or lower.

3.78 with Draught Mythic is 5.67 APS. lasts for 5 seconds with a 5 second cool down.

since you are taunting enemies to you, using Earthshatter and/or Torrent for more damage is really nice.

another way to go is using Discordance Mythic. put Multi Shot Skill on the Hammer so that Smash will do 1050% Weapon Damage every 3 seconds. Smash 40 is 3150% weapon damage.

3 seconds with +60% cool down is 1.2 second cool down.

1.2 seconds with Hunger Set (5) is 0.75 second cool down.

if you use +50% Torrent Proc., it will have the same cool down as Smash if you have Torrent 40. you average procâ€™n Torrent on every other Smash, and Torrent last 5 seconds.

just the damage from the crit damage boost is awesome. when you have crit damage maxed at +350%, with the base +50%, you do 5x crit damage. with Smash 40 you do 15x crit damage. and if you use Deadly Strike, you have a chance to do 30x crit damage with Deadly Strike. if you have Brutal Mythic, you would do 45x crit damage with Deadly Strikes.

just some thoughts. of course, the numbers will be lower in PVPâ€¦ I thought about this for PVE actually.