Then 2 Daves have the basic storyline and how it ends, so it shouldn't be a million miles away from how the books go. The last series was a was a bit rushed, but still good. Ideally, it would've been 9 Series long and had less magic teleporting characters, but the basic story is still good. There's still plenty of action and loose ends that need tying up and if done properly, should make for a really good last series. If you want a show that has lost the plot and crashed, look no further than the walking dead. Now there is a show on its ass. Fairly main characters bumped off just before their big role in the story, shit writing, drawn out, crap episodes that could've been done in half the time.. The 2nd half of this series better be amazing, cause the first half was gash. It's such a shame, cause both shows were amazing for a long time, but both have moved away from what made them so good in the first place and started to decline. TWD more than GOT, but neither have that "can't wait for the next episode" factor anymore.
Late to the game on this, but finally got round to watching it, if anyone hasn't yet and are comic book / batman fans, then Gotham is a bloody good watch! Rinsed 4 series in about 2 weeks and patiently waiting for the mid-season break of series 4 to end to get back on it. Really highly recommended.