Felon said:
What a peculiar response. In combat, mind flayers just mind blast, that's about it (granted, there are those DM's who abuse the charm ability in battle by blatantly ignoring the +5 Will save bonus). They are terrible grapplers; with low grapple checks and weak damage. It's a tactic solely intended for pulling the brain out of a stunned victim's head.
I must be doing something wrong, because I've used mind flayers in my campaign twice now, and in both cases, they were quite effective and certainly did not use mind blast every round. Their damage is not "weak" considering they have four primary attacks; that's pretty good damage for their CR. And they are dangerous; my party's paladin came within a few initiative points of having his brain sucked while conscious.
If you give them a couple of monk levels, their grappling abilities can increase substantially, and they become dangerous in other ways, as well. Tumbling attack to attack the party spellcaster, grapple using Improved Grapple and Improved Grab, is pretty mean.
I would say mind flayers are, if anything, overly dangerous in melee and grappling situations for their CR.
Of course, advancing in a character class is rather beside the point, since a monster is at that point just doing what a human could be doing.
... if they had four natural primary weapons, improved grab, and the ability to kill someone instantly by pinning them.
Well, it handily meets the definition--firing worthless, weak-damage, low-DC poisoned arrows from range, and relying on the gaze attack up-close--so I"m not sure what your disconnect is there.
Hm, CR 7. Assuming a level 7 opponent with a good Fortitude save... +5 base, say +2 from Con, +1 resistance from something... that's +8. They have better than a one in four chance for each hit of taking 1d6 Str damage. Per hit. Of course, that's their poison. I don't see a poison listed for their arrows. Oops?
Anyway. If you don't get close, they're fair archers. If you do, and you will, you risk petrication, and if you somehow get up on them, they're poisonous. Classic damned if you do, damned if you don't kind of monster. At Cr7, they look pretty good, and they are easy to advance.