Monitoring reading

I've been reading fiction throughout my life and I seem to have developed a number of strategies for evaluating - or perhaps it might be better to say monitoring - what I'm reading as I go along. I don't think they'd have universal appeal or that they might just simply work for anyone without any modification, but they work well enough for me and just because of that they may be worth sharing. So here we go. First of all I want to be won over by a writer, and I want that to happen fairly quickly - in the first couple of pages at least. I want to enter the world of the writer. Nothing too flashy but just enough to make me want to carry on. Maybe it's a gentle hint of what might follow, a voice that appeals, a setting or interaction that intrigues me. Then after the start I tend to apply what I call the 100 page rule. At this point, do I understand what's going on? Do I feel sufficiently hooked in to continue? Do I want to know what happens next? Can I get some sort of purchase on the different characters - can I remember who they are? In the past I've just abandoned what I'm reading if it fails the 100 page rule. Nowadays I'm a little more forgiving and may persevere for a while. And then next, about halfway through, regardless of the length of the thing it's the halfway point - I'm asking myself 'Is it worth carrying on?' or have I just had enough? Life is short enough. My default tendency is to give a writer the benefit of the doubt. I know enough about writing to know how much effort is required and just how hard it is to say what you want to and how easy it is to fall short. Writers should be given the benefit of the doubt. But this halfway point is very significant to me. It usually helps me to distinguish between the very good and what's good enough. Of course, you never really know until the end - that's just the way it is. By way of example, at the moment I'm reading Colm Tobin's The Blackwater Lightship. The first couple of pages are excellent. That's definitely a tick, then. By page 100 I note that I'm completely absorbed. It's certainly got more to give. At the halfway mark I have Declan, a central character, at his grandmother's bleak abode, dying of AIDs. Present, a couple of friends and various members of his fractious family. Is it worth continuing? Well I'm not put off, but neither can I see much in terms of resolution for the family. How will it end? Declan's got a one way ticket - there can be no surprises there. Sad or tragic though it may be, he will die. Things hang in the balance but nothing much can change by the logic of the book's own narrative. Yet the second half manages to open up the back stories of the characters in a way that is so much more plausible than other two parters (Lauren Groff's Fates and Furies would be an example). This gives Tobin's novel additional depth and nuance. It looks like there won't be an easy settlement but as Declan's health becomes progressively worse, the three generations of women move closer to understanding one another. It's as close to a resolution as we're going to get and the writing is very good. There's a small dazzling window when Tobin's narrator captures Declan's sister's despair: 'Imaginings and resonances and pain and small longings and prejudices. They meant nothing against the resolute hardness of the sea ....It might have been better, she felt, if there had never been people, if this turning of the world, and the glittering of the sea, and the moving breeze happened without witness, without anyone feeling, or remembering, or dying, or trying to love.' Bleak, but blindingly good - I guess that's what Tobin intended.