Actually, I justed started the Dark Tower saga myself. I'm up to book two and I'm hooked. It's just hard to find time to do some heavy-duty reading when a lot of games I've been anticipating are coming out so soon.
When you'll be in book three you will be amazed by the plot. Book one and two are just the prologue of the big adventure.
I suggest that you read Eyes of the Dragon, The Stand and Insomnia before going any further in the saga. You will enjoy more the series.
There's also Talisman 1 and 2.