@mysterioz: 1- not true. to create husks and the likes, it takes very little time, specially with Dragon's Teeth. to indoctrinate silently like they did with Saren or the Illusive Man it takes a long time and long exposure to artifacts, but NOT to create armies
and the Reapers don't need the Mass Relays, the whole point of the relays is to control the development of the organic species so they can easily reap them in the next cycle!
how can you just say the Reapers have superior tech and then assume the Covenant fleet and the UNSC infinity can take on them easily?
1. no play ME2, the same level you find Legion you find auto diaries on how Cerberus employees were slowly being indoctrinated you must be thinking when they can turn the corpses of the dead into husks two very different things one requires the presence of being near reaper tech and the other is being killed and converted.
2. Ah yes they do, [they need it to get around] with out it the ME races would have won because of the prep.
Tell me how are they going to get around the Halo verse while cruising at 30 light years per day? they would get ambushed from all sides by Covenant ships,
3. Covenants ships and the Infinity are based on Forerunner technology, you know the same people who created planets for the luz and space ships that can power small moons?, Reapers are just more advanced than the standard UNSC ship.