the art is still good but maybe they should update their monster roster some more... they are still the same old one they have been using for years already.
There's been a *slow* trickle of new monsters over the years but yeah, it's at the rate of maybe one or two new monsters a year. Returning monsters will sometimes have different appearances (regional differences, perhaps) but it pretty much all just boils down to "this is what Kazue Yamamoto wanted to draw this month."