Yes, it can be done with melee and yes IWT is required. However, as I said to you in one of your earlier posts, there's a lot of places where caster teams have things a lot easier than melee teams. There were a lot of places where I had to seriously outgear the dungeon content in order to be able to eat the damage. I also spent a lot of time wiping repeatedly practicing movement and timing.

Grand Vizier Ertan - bring everyone in right on top of him, and try to position so you're all facing different directions to keep the Lurking Tempests from attacking. As soon as he summons the tornadoes, stop DPS, make everyone follow and run out to avoid getting the tornado debuff. As soon as the tornadoes start to come back out, follow again and lead everyone back to the boss, again, making sure you have some facing different directions for the Lurking Tempests.

Altairus - Fight him in the center of his platform. Break your healer off before you engage and leave them a good distance from the rest of your team. Run in with DPS and Tank and turn the boss so your DPS and healer are behind or to the side of him. Use strafe to keep your DPS and healer Upwind. Try to dodge the tornadoes, and be ready to heal the Chilling Breath.

Asaad - easy for melee. Jump to avoid the static cling debuff. Get in the grounding field. Get free lewtz.