He/she is either misleading or misinformed.
No major, widespread issues a la Palm Pre were in the 920 nor 925.
Personally, I have a 920, and it doesn't have any major problems. There are defective models out there, but it is the same with any phone.
The 925 is more than "but a fix" of 920 issues. It is a variant, it has pluses and minuses.
920 has over the 925...
32 GB memory default (the T-Mo and most other 925's have 16)
Colorful plastic housing.
Qi wireless charging built in (925 requires external case)
IPS LCD display (which is better is subjective)
925 has over the 920...
slimmer metal housing, available in shades of grey
AMOLED display tech
slightly upgraded camera
it will work best with T-Mo (if you get the T-Mo model)