Anyway as promised I'll start the dreamcast worth getting thread, theres shitloads of good dreamcast games, average and relatively few bad ones when compared to others. *cough, sony quality control cough*
Dreamcasts are dirt cheap, most games are cheap buy one on ebay its worthwhile, runs emulators well for nes , master system, spectrum, commodore gamegear etc. And for anyone doing so heres a list of games worth buying, or getting.(Gens and Dreamsnes are better on PC soundwise but the DCs are good apart from shite sound, Fact is all megadrive shmups you can play on dreamcast

Anyone is welcome to contribute, but the objective is to inform people of great games. Start off with an index then at a later date I'll sort out into genre groups top 5 of each.(leaving shoot em ups out due to the controvery that will arise) I'll add more at the weekend when i see my collection again

SoulCalibur
Ikaruga
Border Down
Mars Matrix
Resident evil code veronica
Rez
Trizeal
Quake 3
Grandia 2
skies of Arcadia
Zero Gunner 2
Street fighter 3 3rd strike
Alien Front Online (Kick ass online tanks vs aliens)
marvel vs capcom 2
virtua tenis 2 and 1
Giga Wing
Giga Wing 2
Gunbird 2
Virtual On Oratorio Tangram (Better with twin sticks)
Samba de Amigo (Need Maracas, fun as hell)
House of the dead 2
star lancer
Fur Fighters ( Cute hard massive and hilarious good call)
metropolis street racer
shenmue 1 and 2
Toy Commander (Soooo Underated)
Cosmic Smash
Ecco The Dolphin
power stone 1 and 2
Project justice
Shikigami no Shiro 2
Capcom vs SNK 1 and 2
King of Fighters 98
Dead or alive 2
Sonic Adventure 1 and 2
Phantasy Star online ver 1 and 2 (When it was still online worldwide)
Crazy taxi 1 and 2 (very reptitive but good)
Chu Chu rocket
Rayman 2 (bit cute but good platformer)
Jet Set Radio
Test Drive le Mans
Sega Rally 2
Alone in the Dark 4 the new nightmare(Kicked resident evil 2 out)
Bangai 0
Seggaga (Company makes fun of themselves, truly unique)
Thats enough to get anyone started and none of them is under 8 out of 10
Lot of good ones
MDK2
Psyvaria 2
Chaos Field
Tech Romancer (Capcom roster involving big robots)
Twinkle star sprites (Sorry if this placment offends)
Quake 1 bootleg (Seriously, quake improved graphics on dreamcast)
Street Fighter Alpha 3
Tokyo Highway 2 (Seriously, its good once u get into it)
Hundred Swords
Sword of the berserk guts rage (Hack and slash romp)
Puyo Puyo Series
Super Puzzle Fighter
Frame gride (cool mecha upgrading combat sim)
Super Robot wars Taizen Alpha (nice turn based strategy rpg lots o robots)
Propellar Arena Bootleg(Got recently, should have released it)
Typing of the Dead, (Original and novel Concept= kudos)
confidential mission
fatal fury garou mark of the wolves
marvel vs capcom 2
King of Fighters (others)
street fighter alpha 3
Ready to Rumble 1 (sequel just not as good)
Revolt
Half Life (Bootleg, its half on DC yes full game but not great port)
Record of Lodoss War
Virtua fighter 3 (Okay game but terrible conversion, Bad AM3 Bad!)
Deadly Skies
street fighter 2 Ex grandmaster challenge
4 Wheel Thunder
Cannon Spike (Not a Shmup imho)
Unreal Tournament
Resident Evil 3 Nemesis,
Dino Crisis
Tony Hawks pro skater 2
Trick Style (Good idea but bad execution, i like it)
Red Dog (contender for best multiplayer + some good sections)
Above 7-8 out of 10 region some may be higher in others opinions
Below Avoid like the Plague
spec opps 2 omega squad
moho
mag force racing
spirit of Speed
Blue stinger
Carrier