If you want to DPS, you can boomkin but you will be nothing more than a 5man maybe 20 man raider. Boomkins do not have the sustain to play beyond that as fights start lasting longer the 60-90 seconds then and you will run low on mana even with drinking mana pots and using demonic ruins on cooldown(you will also spend 3 times the time you play raiding farming demonic ruins). Shockadins were a meme and only really for PVP lols. They were not effective DPS at all. If you want to dps in any raiding environment you are limited to the top 3 dps classes mage, warrior and rogue or the 2 utility classes warlock and hunter.