Debatable in Clash of the Elements like most tropes on this page, but while Part 1 has some glaring grammar problems and lack of focus at the beginning, the story steadily improves throughout and becomes rather consistent around Chapter 13...Though there are still some grammar issues here and there. However, the beard grows even further in Movie 1, where there is a LOT less grammar mistakes, the battles feel more steamlined, and more details words are used in the narrative to avoid repetition. And finally there is Part 2, which removes nearly all grammar problems, has a fluid narrative with great battles, and a better focus on the characters and villains. It is pretty impressive to read through at that point considering that this is a Mario fanfic and all.
Although the Tamers Forever Series is an undoubtedly fun and surprisingly well written series, it's still fairly average, until "Forget the Y2K, This is Madness!!", whereupon the series adopts a quality of writing that is on par if not better than that of professional authors.
The Wizard In The Shadows starts out as a straight up Tenth Walker, albeit a good one with a few minor variations, but really begins to hit its stride with the Breaking of the Fellowship, and a following ability to develop its own identity and the author developed and refined his style. This is signified by an increase in the length of the chapters to consistently 3000 words plus.
Escape from The Hokage's Hat starts off slow with the first two arcs basically being Recycled Script bar certain details and mostly dealing with the power plays and politicking between Jiraiya and the council. Come chapter 22, the story picks up from the previous rather Filler and isolated feel the first two arcs as more of the world gets involved in the story.