Yes! I have noticed the quality has declined in A LOT of their products while the prices are getting a bit high. I remember when I can actually buy a clothing piece and have it last throughout a season.. Now I am lucky if the piece isn't ripped after a few washes/wears. I also noticed that after I wash the clothes from Forever 21, the material becomes extremely thin (especially on pants).
There was an article that was released recently about what you shouldn't buy at F21 because of how poor the quality was.. Shirts, pants, shoes, jewelry, lingerie, jackets, purses, etc. were on the list. Basically the whole store.