what praises did it receive?
Initially it was praised for the upgrade to Genesis and its high-quality and expanding library of games.
Sega CD
Near the time of its release, the Sega CD was awarded Best New Peripheral of 1992 by "Electronic Gaming Monthly". Four separate reviews scored the add-on 8, 9, 8, and 8 out of 10; reviewers cited its upgrades to the Genesis as well as its high-quality and expanding library of games
what is 'sega cd'? A  CD-ROM accessory for the Mega Drive/Genesis . which company manufactured them? Sega. name a few electronic parts of this product. The CPU is a Motorola 68000 processor,a Backup RAM cartridge, RCA pin jacks, etc. when was this product first time sold in the market? It was released in Japan on December 12, 1991. what are the different models of this product? Two preivious models developed by Sega , and the Genesis CDX,  X'Eye,  Wondermega and others. can any random music cd be played on that device? It can play CD-based games, audio CDs and CD+G discs. what games were generally played on that device? FMV video games. was this device a breakthrough or a flop? Retrospective reception of the Sega CD is mixed, praising certain games but criticizing its low value for money and limitations on the benefits it provides to the Genesis.
wiki:19607359
Sega CD [SEP] Reception and legacy
Near the time of its release, the Sega CD was awarded Best New Peripheral of 1992 by "Electronic Gaming Monthly". Four separate reviews scored the add-on 8, 9, 8, and 8 out of 10; reviewers cited its upgrades to the Genesis as well as its high-quality and expanding library of games. Later reception in 1995 by "Electronic Gaming Monthly" showed a more mixed response to the peripheral, with four reviewers scoring it 5 out of 10, citing its game library issues and substandard video quality. "GamePro" also criticized the weak games library and substandard video quality, noting that many of the games were simple ports of cartridge games with minimal enhancements and commenting that "The Sega CD could have been an upgrade, but it's essentially a big memory device with CD sound." They gave it a "thumbs sideways" and recommended that Genesis fans buy an SNES before even considering a Sega CD.