I hate shardminds. Well, I hate them mostly because WotC tries to give them something resembling boobs in their pictures. But I find them really pointless. We still don't have, say, goblinoids as actual races in 4e (just a stub in the MM) but we get, uh, shardminds?
I was greatly unimpressed with the Monk. Finally having a psionic monk felt like an improvement and I was looking forward to seeing one in action. One of my friends roled a Monk and... man... was it horrible. Our Warden routinely did more damage than him and even the Wizard was tougher than Mr. Monk.
Sadly, I have yet to find any DM who allows hybrids. I really wanted to play an AvengerlSwordmage but then WotC just had to nerf Avenger's AC (and now they suck).
People have mentioned that power points are borked, but I never say them in play, so I really don't know. Feels like a much needed mechanic to break 4e's constant 'everyone is the same' mantra.