Chimera does have very high defense. So a straight DD tank will have a tough time with it, especially building the initial Enmity before everyone starts in.
What you need to consider is capping both STR and MND. You can get into the 30+ Damage range on Flat blade combo with a high DPS weapon.
With the Multiplier increase and damage from MND + extra damge from STR, you can generate 221+ ENM, 3-5 times a minute.
With just the low base stats with you will be generating around 83 ENM, 3-5 times per minute
(these are without Sentinel)
But on the flip side, you have other non damage skills that can benefit from ENM+.
So Taunt and Flash, etc. Which with 200+ ENM will get you around an extra 20% ENM on top of what they generate, every minute.
So add it all together (worst case scenario 3 Flat Blade Combos)
STR+MND, Taunt+Provoke (1000 ENM) Damage Delt (663 ENM) Total 1663
ENM + , Taunt+Provoke (1200) Damage Delt (249 ENM+20% = 299) Total 1499
The damage may seem insignificant, but it adds up, as does your ENM generated
On a side note: A great starter for Chimera is Sentinel, Aegis Boon, Phalanx, Bloodbath, Spirits Within, Holy Succor. You will have to get quite a bit of hate and self heals in before that first WHM tops you off for 1k HP, then you can just continue your normal rotation.