These are relative conclusions as it does not tell us what their standard is on sound quality. gsmarena.com compares it at least with some other phones + they complain on the crosstalk when listening with headphones.
If they compare the speakers with e.g. a Nokia xpress music phone like the 5800, of course it is bad, but if you check the speakers of the several HTC desires (mine being a normal desire), they all suck bigtime. The LG will not perform any worse.
It also seems difficult for manufacturers to get decent sound out of the modern flat phones anyway.
Crosstalk is something which probably can be fixed inside the software, EQing and therefore loudness as well.
I am curious though, phone probably arrives next week and I will report asap.
Sent from my HTC Desire using XDA App