What are the disadvantages of DVD

Vagueness of the DVD specification and inadequate testing of players and discs has resulted in incompatibilities. Some movie discs don't function fully (or don't play at all) on some players. (See 1.41)
DVD recorders are more expensive than VCRs. (See 1.14 and 4.3)
DVD has built-in copy protection and regional lockout. (See 1.11 and 1.10)
DVD uses digital compression. Poorly compressed audio or video may be blocky, fuzzy, harsh, or vague. (See 1.3)
The audio downmix process for stereo/Dolby Surround may reduce dynamic range. (See 3.6)
DVD doesn't fully support HDTV. (See 2.9)
Some DVD players and drives can't read CD-Rs. (See 2.4.3)
Some DVD players and drives can't read recordable DVDs. (See 4.3.1)
Most DVD players and drives can't read DVD-RAM discs. (See 4.3.4)
Very few players can play in reverse at normal speed.
Variations and options such as DVD-Audio, DVD-VR, and DTS audio tracks are not supported by all players.