I've read a few of his books as undemanding beach-holiday escapism, and I've watched a few of the adaptations; overall, the books work a bit better as they're all set in the USA so the 'Hollywood' suspension of disbelief works in the same way that you can, for example, buy into Diehard whilst acknowledging that it's ludicrously implausible. Oddly, transferring them to an undefined English county doesn't work quite as well (especially given the plot reliance on guns, remote woodlands, etc.)
Each time I start one of these books or series, I get hooked by the deliciously intriguing premise (which almost always involves someone dead/missing potentially reappearing), then I start to find all the diversions and red herrings a bit tedious, but I keep going in the hope that it will all come together with a satisfying finale, then there's a bullshit ending and I get very annoyed and vow 'never again!' Until the next one sucks me in and I think 'well, it can't be as bad a the last one ...’