I agree. The idea of using a curl instead of gigantic bottom slab serifs is nice, and the glyph looks good in isolation and word-finally, but elsewhere it really messes with the density. I would also prefer that lowercase I curl in similar fashion—if only because my handwriting is like that.

could you provide a sample sentence that shows this? I don't get the same impression.

If you look at the paragraph sample on the webfonts[1] page. you will see it. Also, you could type words like 'flow' or 'follow' into the sample box to see it next to other fonts. This really highlights the extra space on the 'l' glyph.

[1]http://www.google.com/webfonts

ah. I only really notice it in multiple L's. It uses the openfont license though. Which means you can legally crack it open using fontforge and adjust the kerning, and redistribute it as pt mono improved if youd like