The 2003 finale was probably the peak of Gretel's genuine happiness across all her BB series with Reggie and Chrissie as the final two and then Reggie winning. I remember following the leadup to the season here on BBB and the daily updates back when it first aired and it felt like such a good season overall even back then. The season launch episode is probably my favourite BB episode of all.
After Vincent left at final 5 there was really no conflict whatsoever, even with Anouska still in the house, so the daily shows didn't have many new storylines to show. They were fortunate to have two stellar housemates in Reggie and Chrissie to keep things mildly interesting for those weeks but I can see why they moved towards more events and speeding up the endgame in future years.