The word 'shoddy' implies disapproval and suggests that something is not just poor quality but also disappointingly so. I can't believe how shoddy this toy is; it broke in one day.
Pro Tip 2/3
Non-Literal Use
'Shoddy' can be used metaphorically to describe anything poorly done, not just physical items. Your argument is full of holes; it's pretty shoddy reasoning.
Pro Tip 3/3
Casual Critique
Use 'shoddy' in informal situations, like when critiquing a friend's hasty work, not in formal analysis. Your repair job on the bike seems a bit shoddy.