HHN is indeed somewhat remote but the good thing about that is the 24/7 operation over there (no curfew!). Road connection is being greatly improved since the current 2-lane B50 is being upgraded to 4-lane expressway (some part have already been completed and opened). Works should finish sometime early 2009 which will cut down travelling time to FRA substantially.
The place can indeed receive a solid amount of snow during winter months but the Airport Authorities have invested millions of Euro's in probably the largest fleet of ultra-modern snow clearing equipment to be found anywhere in Europe. If you happen to stage through HHN just ask the Airport Authorities to tour their 'Winterdienst'storage facilities and you will be amazed!
Finally HHN's people are indeed a pleasure to work with. Always willing to help and they go out of their way to make you feel welcome. I would recommend it over FRA anytime!