No, it's not just you.
G2 speakerphone is on of the WORST in the entire mobile phones.
Far worse than the non-smartphone Nokia flip-phone that I had 10 years ago.
If you install viper for android you can boost your speaker. .I was able to get Volume + from the market to boost some sound.
The right kernel helps. Paek has been working well.
Realistically this is still a work in progress on every rom.