Biased or not, they have a good point.
Everything in life needs balance. This shouldn't be news to anyone. Being morbidly obese is bad. Anorexia is also bad. In the middle is good, but not optimal. Healthy thin is the sweet spot.
My '09 MacBook Pro 17", IMO, strikes the perfect balance. It's healthy thin. Sure, it doesn't have a battery door, but that's no biggie. If you need to replace the battery just bring it to an Apple Retail Store or Premium Reseller and they'll do it quickly, and at a cost that doesn't hurt too much. Upgrading RAM or hard drive is a no-brainer. You remove 10 phillips screws and whammo, there it is. It's beautiful inside, actually, the layout is an absolute work of art.
This computer is thin enough. I've checked out the Retina MBP in stores. It's nice. But the decrease in thickness doesn't push any buttons in me to make me go "Yes! THAT's what I've been missing, my life will be so much better now." Retina display, no optical, that's awesome! But thinner...? Shrug. If it was critical to me I'd get an MBA.
So what are the tradeoffs that needed to be made? They're huge! They've turned it into Fort Knox! Proprietary SSD, glued battery, RAM soldered to the motherboard. For what? For *shrug*.
I mean jeez, they got rid of the optical drive, good move, wasn't that space enough to make it slightly thinner but otherwise keep the (perfect) layout as it was? My wallet votes a big fat no on this crap. Proprietary non user upgradeable storage and RAM in a laptop = no sell. The anorexia fetish freaks can have the MBA and put it in a manila envelope and jerk off to that, or whatever it is they do, but do not destroy the MacBook Pro line.
Apple has gone anorexic and they need an intervention. Someone needs to bitchslap Ive, Mansfield and Riccio back into reality and scream "DUDES! STOP! OK? Stop. Just stop. You've lost it. Enough is enough. Think different has taken you to a bad place this time around." EPEAT should be among the many doing the bitchslapping, but apparently they have as much spine and balls as the US patent office.