I don't see what all the frustration is about. Motorola has announced that the Atrix 4G, along with many other new releases, will have their bootloaders unlocked by future software updates.
In addition, look at how many ROM's are available for the Droid X and Droid 2. I would hardly call that "stuck" with stock. CyanogenMod Roms are being refined currently, and there is little doubt that stability will be reached eventually. The only challenge I see right now is overclocking and optimized kernels.
The Thunderbolt is probably amongst the hardest phones to root and hack. Yes, the bootloader has been cracked, but still no stable CM7 for it? Sense is caked so heavily onto the phone and all of the coding, I'd imagine that creating a stable AOSP ROM would be very tough.
For those of us who want a phone that "just works", Motorola is the way to go. I can't wait for the Bionic, locked bootloader or not.