I think returning to the old continuity is the most obvious choice as far as effort is concerned.
With all respect, I disagree with this opinion.
Perhaps, but who knows? I don't think the unusual choices regarding design, music etc. are relevant.
I think it's all relevant. Judgement was an experiment and developers went all out with it, striving from old conventions as much as possible, including blending line between different timelines, which wouldn't be possible in regular CV game.
Well, I'm not seeing these shady moments you're talking about, so I can't really comment on them. As for the timeline being a mess, I was just talking about hard continuity. If you think the timeline sucks because there are a few mysteries that have yet to resolved then I wouldn't try to change your mind about that. Honestly speaking, I don't think many people think it's a issue. Most fans are at the very least just indifferent about the old timeline.
I like to have tidy and clear timeline, in which almost every important detail, that have connection to the main plot, is clear. CV old canon have too much holes in it and since storyline is one of the main aspects in any game series to me (especially in CV, where series lately made a LOT of emphasis on its story), this makes CV old timeline rather messy and sad to me. I am not "most fans" and its an issue to me.

Coppola didn't start that cliche and IGA just ran with it like Coppola. Coppola said Vlad Tepes became a vampire. IGA said Dracula had been a vampire for four centuries before becoming Vlad Tepes. Just because both Vlads use the same cliche backstory doesn't mean IGA ripped Coppola's story page.
Similar origins of the same character in different incarnations, are too much of the coincidence. And I don't believe in coincidences like that.
And the plot holes/timeline is just fine. Westerners just typically lack the ability to cope with loose ends. They see a hole in the wall, they squirt toothpaste into it so their minds can be at ease knowing the wall is complete once again.
What we have in old canon is not "loose ends".
Those are annoying holes, that doesn't take any effort to be cleared in a one single game. They are results of the unthought writing.
I am personally OK, when there are some things left unsaid, like in "The Big O" for example, that I really liked. I am not OK with the bad writing and very important things being left out without any single good reason.
I don't think "love story" is mandatory to make a good plot.
Hell, plot holes always strike up good fan theories and ideas. That type of conversation is well worth it's weight in gold(and is fun to, as long as it's an friendly exchange of theories that aren't interupted by the logic police, AKA the "rain on everybody's parade" people).
Loose ends could be discussed, but I don't see point to discuss things that should have a definite answer, that writers never cared to provide. It's not thought provoking, just annoying and unneccesary.