Many of these have been touched on, but here's my full list.
I think the TG16 designers made a lot of trade-offs, so peeves with corresponding good qualities are listed first.
Trade offs
*One controller port - first 16-bit system for $99
*No AV out - see above
*No battery backup - sleek media
*No light gun - no stupid light gun games
*2-player games almost nonexistent on TurboExpress - TE shares TG library
*Poor CDR compatibility - no region protection
*Multiple system cards - games released from '87-99
Peeves
*Only three tip books were published
*Barely covered in gaming magazines
*Frequently "discovered" by modern retro enthusiasts
*Side-mounted AV out (Duo)
*Cheap, leaky capacitors
*Short controller cords
*2-button controllers
*Janky controller pins stop working (Turbopads)
*Low-quality joysticks (U.S.)
*No first party wireless controllers (U.S.), system cleaner, or TE battery pack
*21 hucards sold without cases
*Crappy hucard adapters