if it has not fully carb'd yet for 3 weeks, you're not gonna have the right mouth feel from the bubbles, and it will make it seem under-bodied.
carbonation presents aromas and flavors, so it might taste 'weak' right now.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10