ME 1: Liara, Tali, Garrus, and Wrex are recruited, but Wrex is killed by Shepard on Virmire. The choice of who dies between Ashley/Kaiden is made by the player during creation. Feros was not saved and the Asari that was taken by the Thorian died. Shepard did not have a romance. Rachni queen was killed, as was the council and the Destiny Ascension. Udina was named Councilor and no side quests/DLC were completed.
ME 2: No loyalty missions were completed (also Zaeed and Kasumi were not recruited.) Mordin never had the chance to keep or destroy the genophage data. Tali was exiled. Shepard still did not have a romance. Grunt was never woken up from his tank. Jack and Thane died. Tali, Mordin, Garrus, Miranda, and Jacob survived the mission. Samara was never recruited, she fought her way off Ilium only to be later killed by Mornith. Legion was never activated and does not go by that name in ME 3. Only non-party crew members to survive were EDI, Joker, and Chakwas (rest of crew liquified.) Shepard destroyed the Collector base. No other side missions or DLC were done, but the events of Arrival and Shadow Broker still happened "off screen."