For instance:

Every time I look at something on the lower part of the map, this icon stands out like a sore thumb, in contrast to everything else on the screen. This lens flare effect doesn't belong on elements of the UI (because it's distracting).
There's a trend towards making the center of the icon bright, which makes the contrast between the light and dark parts of the icon too big, and this is distracting:




This type of effect just strains the eyes and doesn't make the icon look better:


Whoever is working on this, please consider the primary purpose of what you are creating - it's not about the cool effects, it's about being clear about what the icon represents and not being distracting to the player. Good icons are simple in design and easy to recognize and differentiate - they are not pictures.