I'll probably give it a chance, but my hopes aren't high as to the quality. Still, the original TV series was and is so fantastically good that we don't need another TV or film version. And I agree that the film was rubbish, it was so bad that even Martin Freeman (who is almost THE actor for an 'every man' character) couldn't save it.
The radio series is great, at least as far as I've heard. I know I've heard the first season, but I've just checked Wikipedia, and apparently there have been six radio seasons. I'll try to get to listen to them, but I've no idea how good or bad they'l be, apart from the sixth season, which is based on Eoin Colfer's novel And Another Thing, which I didn't like at all, so I'm pretty sure I won't like season six.
To me, though, Douglas Adam's novels are the best part of the Hitch-Hiker's Guide to the Galaxy, at least the first two books. The original book, The Hitch-Hiker's Guide to the Galaxy is very good, the second book (Restaurant at the End of the Universe) is my favourite of them all. The third book, Life, The Universe, and Everything is extremely variable, having some very good parts and others that are either awful or just don't work at all. The fourth book, So Long and Thanks for all the Fish, is much more consistent in it's quality and writing than Life, the Universe and Everything, but mostly just doesn't feel like a HHGTTG book. The fifth book, Mostly Harmless, is strange. It has some good ideas, but feels wrong for some reason, like someone who isn't Douglas Adams found Adams' notes and wrote a full novel around them, but lacked Adam's wit and ability to make the disparate threads tie neatly together and make you think "Of course, why didn't I see that coming?".
My advice re: the novels is to definitely read the first two, and if you want more, then give book three onwards a go.