I'll add that there are a couple of absolutely superb lower alchohol beers out there. Magic Rock Simpleton at 3.0% and Kernel Table beer that was 2.8%, now 3.3%. Both fantastic and taste much bigger than they are.
The trick is getting body and flavour into the beer. There are a few things to consider:
1. OG vs FG. You can still have a high-ish OG, and more body and/or residual sweetness and still end up with a lower alcohol beer if the yeast doesn't attenuate as much.
AG brewers can manipulate mash temperature to achieve this, but for all brewers, careful yeast choice will drastically affect things. For instance, using WLP002 English Ale yeast, rather than S-04 or US-05. The lowest attenuation for WLP002 is 63%, which means you can have an OG of 1.035 with an FG of 1.013 and ABV 2.9%. Extract brewers are more limited, but use of speciality grains will enable you to manipulate attenuation by providing more long chain sugars that the yeast can't break down into alcohol.
Kit brewers could use a portion of maltodextrin to add body, but no sweetness which will make the beer seem "fuller".
2. Use of speciality malts. You can build in residual sweetness, body and flavour by using slightly larger amounts of speciality malts such as crystal, roasted malts, aromatic and biscuit malts etc. AG brewers can use more interesting base malts such as Munich and Vienna to impart a more interesting malt character.
3. Hops. Don't underestimate the power of hops to deliver flavour, mouthfeel and make a beer seem "bigger" than it is. The two beers named above do this incredibly well.
There's some food for thought there anyway. Lower alcohol (<3%) can be things of beauty, but you do have to think about it a little more.