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*** Spoilers ***
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Breja: <snip - Breja is upset>
Only just caught back up with this, but you're generally right. The thing you're missing I think is not that he chose bad directions with the plot, it's that he is incapable of finishing things. It's a bit like Game Of Thrones will eventually be revealed to be, lots of plot openings, lots of threads, lots of possibilities, no conclusive ending.
It's a shame, he could end his shorter stuff ok, but ending that, after all he set up, not a chance. He didn't even try, just carried on writing new avenues, giving new "outs" to people. He didn't even dare try to wrap anything up, and tried to put a number of episodes in one script.
I'd class it as in the same quality as a Michael Bay ending - "I send this message to all viewers, this is the ending! There will be a sequel!"
Really wanted a good Timelord face off, with Rassilon properly shown as a character, with the doctor torn between his world and possible destruction with it from the hybrid (boy did that go stale, "it's you, or me, or perhaps both of us, or maybe these people, or... well lets just say I can't be arsed to finish this plot"). They could have done a fantastic episode without ever leaving that barn.
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I feel your pain.