in what dramatic way is paragraph one such a gripping introduction in chapter one?

This first section of Oliver Twist is especially focused on the failures of the systems in place to take care of the poor and helpless - particularly orphans. The narrator, with his deft use of sarcasm, shows how little those entrusted with Oliver's care actually care about him (or any of their charges, for that matter). Most of those put in this position of guardianship are utterly convinced of their moral superiority to their paupers, just by virtue of their not being paupers, and so they consider it their duty to keep the paupers in their place.