"My dick is huge and here's the wall of text to prove it!"
Your critique is partly valid. However, I don't have any rage problems. I have 3/5 Offhand Spec, which is a offhand damage loss of about 5%, not 10% as it only increases 50% offhand damage by 25% damage with 5/5 - so it increases offhand damage by 15% with 3/5, which is 50% + 15% = 57,5% instead of 62,5% with 5/5 Offhand Spec. On top of that I have 5/5 Enrage, that can set it more than off when it procs (on some bosses easily, on some bosses not, of course), as stated by Shaa and copied from me.
"Your gear and gemming choices leave much to be desired. "
Can't confirm this at all. My new equip with 4/5 Siegebreaker was doing quite well on thursday, especially Razorscale/Mimiron where I placed 1. My old gear with zero expertise socketing, Chestguard of the Recluse, 2PC T7 and 2PC T8 bonus is clearly inferior in the spreadsheet and ingame too.
"I can guarantee i will out dps you by a lot."
Honestly, you can't. You underestimate my gear and spec, so you probably underestimate me too.
"Kaan is a good example of why this should probably be fixed. Nobody is doing the amount of heroic strikes as shown."
No, I don't think I'm a good example. My gear is obviously better than 95% of the players to this date. I swim in rage and have no real problems at all. I've previously said, Heroic Strike usage is probably too high in the spreadsheet, but then again, there are bosses where it is perfectly fine. The spreadsheet can't account for everything.
However, as Landsoul already said, the spreadsheet isn't there for 1:1 DPS analysis, it's for SEP and optimizing gear in a perfect world (I almost forgot that). And it's certainly the most times right, doing so, adviced by the spreadsheet. I use the spreadsheet of landsoul for over a year now and it was almost always doing fine for me. So no, there isn't any major problem at all in the spreadsheet, I'd say.