Read the prequel to Medalon, it's better. Another really good 2 book story is Dave Duncan's Children of Chaos and Mother of Lies.
the problem with Fallon is that she needs to have worldwide releases.
I plan to read
Wolfblade at some point. I started it 2 or 3 times so far and never got hooked - but I have 100+ books like that that are waiting for the right moment to read them, so I am pretty sure I will get to it sometime
Prequels are limiting to a large extent and I rarely enjoy them as much. One of the best ever prequel I read was Sean Russell
River into Darkness duology, prequel to the
Magic and Moontide duology - all 4 books big time favorites of mine, all read on publication in the 90's - and I still wished I would have read the "prequel" first
Dave Duncan is not for me, tried some of his books even recently including the
Arena and the
Children 1, the writing style does not agree with me.
The one recent series that was as much fun as the
Tide Lords that I stayed way too late to read each book was Brent Weeks
Night Angel, lots of twists and turns too, but more traditional epic with standard props, so I would not say the series are similar except in the twists/turns/revelations part.
I completely agree that the marketing of
Tide Lords here in the US is suboptimal at best, but...
I also would love a new series continuing
Tide Lords but I am not sure it's going to happen - I have no idea btw what Ms. Fallon's next project is except for an announced short story set in the
Second Sons universe.