The text has the normal problems with text people add just to add text. Mostly people do it because of some sort of obligation. This is a signature and thats why.
The quality on the background and the render are both suffering i guess it is because of the original effects and their quality. The resources you use have to be good to start with or else in the end they'll just end up worse. Try and get some good quality effects and know how to use them.
You can tell you used brushes on this and how you used them wasn't exactly the best way you dragged that weird brush and it made it looks low quality when it wasn't. Just work on adding sharpening layers and some adjustments.
It's good overall for something old
