Examples of "bad" simplified characters/简体字?
for 形聲字, the simplification made severe, unrepairable damages to the chinese culture.

for example, the character 難(u+96e3); it's composed by the 172th radical 隹(u+96b9); and the component (u+26c29), that's a phonetic component, which was shared by numerous characters.

the 說文解字 stated: 難　鳥也﹒從鳥﹒堇聲

while 堇(u+5807) is a character since oracle script, ; later, it's derived to 堇(u+5807) 

&amp; (u+26c29)

back to the phonetic component 堇. in cantonese, 堇 is pronounced as gan2　sound file, which has the 韻母 (final) "an".

so, characters share this phonetic component 堇, guess how they pronounce?

難(u+96e3)　naan4　sound file

嘆(u+5606)　taan3　sound file

艱(u+8271)　gaan1　sound file

after thousands of years, the 韻母 (final) of these characters are changed slightly from "an" to "aan", isn't marvellous?

therefore, the simplified script of 难, 叹 &amp; 艰 lose the phonetic component 堇; that no-one in modern time, or generations in the future would associate the correct pronunciation from the component of the simplified character.

c'est patrimoine culturel perdu ☠

lastly, i think that this question is excellent; i worried about the temporary "hold on" status of it. may i ask the rationale of this decision?