Streamlining original Mass Effect's gameplay systems allowed its sequel to reach much higher commercial and critical success, so it was only natural that the third game would follow the same path. And this is exactly what happened. ME3 is a very iterative addition to the series, focusing on new content, polish and refinement in certain aspects. It even introduces a fresh batch of lore inconsistencies to supplement those already present in ME2, and is equally shameless about this.
The story is a direct continuation of Mass Effect 2's final DLC ('Arrival'), with Commander Shepard grounded on Earth (after apparently returning to active duty in System Alliance after his/her Spectre and Cerberus episodes) and facing a hearing regarding his warnings of Reaper invasion. Reapers show a sense of ironic humour and choose this exact moment to invade, forcing our hero to jump straight into action and once again take the fate of galaxy in his/her own hands and seek ways to defeat enemy, as well as gather allies for a counter-attack.
As usual, Shepard is aided in this task by a team of trustworthy companions, who are a mix of old friends returning from previous games and a few new faces, making for a diverse bunch with many skills to choose from and match to your style of gameplay and personal preferences. Almost all companions are potential 'love interests' (some only after installing DLC) to the point where it somewhat seems this feature was the priority for developers when deciding on the cast (the trend would continue into Bioware's next game - Dragon Age: Inquisition). Sadly, no Krogan party member is available this time.
Being the trilogy's finale, Mass Effect 3 offers resolutions and follow-ups to various story archs from previous game. Some of them are an impressive display of storytelling and attention to player choice, while others are somewhat lacklustre, with near-identical replacement characters showing up to take place of those who did not survive. Still, the sheer amount of effort put into creating a coherent player-affected narrative between the three games warrants respect, even if the results are not always spotless.
Mass Effect 3's gameplay is basically the same as it was in ME2, but more polished in every way. The action part feels better than ever with its gunplay easily on par with contemporary shooters and a variety of characters' abilities introducing another layer to the combat dynamic. All the classes have been changed and rebalanced, encouraging players to try out new builds and allowing for gameplay styles vastly different from the standard Gears of War template of the era. In addition, commander Shepard is now much less restricted when it comes to mission load-out and any class is able to use any weapon set as long as it stays below its weight limit. Weapons can also be customized by modifying them with various components, such as extended magazines or accuracy-improving scopes. These welcome change allows for some very interesting and fun combinations of guns and abilities.
Level design is a noticeable improvement over very linear corridors of ME2. While it still features mostly corridors that are mostly linear, there are now more open spaces, alternative paths and optional branches, exploring which usually nets a loot cache or additional story elements like datalogs. All this makes the overall 'running around' experience more enjoyable and not just a forced delay between firefights and dialogues. Levels are also more impressive from visual standpoint, with some truly awe-inspiring backgrounds, including beautiful alien city landscapes and Reapers wreaking havoc in the distance.