You know, if they'd made a drama utterly faithful to the original book, word for word, scene for scene, exactly the same dialogue and everything - it would have been ruthlessly panned just the same. The book isn't all that inviolate, even if it was what made Wyndham's name (it wasn't his best work by any means). And viewers would realise at once just how dated it is. Well, it would be, the book came out in 1951.
Some might say, the 2009 offering can't do worse than the 1960s Hollywood version, although in my opinion that one wasn't so bad either. Except the ending. Except the dreadful ending. Wyndham has produced his own clumsy dea ex machina, hasn't he? (viz. The Chrysalids). No need to create any more for him.
So, I shall await whatever 'solution' awaits the 2009 Triffids, with just a little trepidation...