EEEW! That is one character I rarely read fanfics on... there was that ONE funny Hagrid/Squid story but... still, ICK. (That would hurt, no??)
Harry and Sev is a good match, true.
Hermione would do much better with Draco or Lucius. Both intelligent men who, now that it is no longer appropriate to look down upon Muggleborns, would do well as a mate to a brilliant witch. Ron makes me think too much of an uncouth guy who comes home every night, grabs a six pack of beer, parks his butt on the sofa and turns on the telly to watch Quidditch all night. He would of course expect Hermy to pop out the little red heads, take care of them and the house and cook lovely dinners (like a Molly Jr...)
If Harry gets a smart, sexy man then Hermione deserves one too.
I am not picky on pairings among my fave characters (SS, HG, HP, DM and LM) any in that group seem to fit well together as I think Hermione proved repeatedly she is quite cunning and could easily stand up to a Slytherin, just as Harry did. (They seem to 'pair' up into threesomes well too... lol.) Some of my fave fanfics have been SS/LM/HG, SS/HP/DM, SS/HP/LM... there are a couple really hot DM/LM/HG too.... : )
Ron needs to pair up with someone like Pansy Parkinson who will train him properly...