This is true, although I would note that Clone Wars implies that a lot of younger Jedi are turning out like Anakin because of the stresses the war is putting on the order and their ability to actually train their students.
The Jedi on their own are not an army. They're diplomats, commanders and elite fighters that are best deployed embedded within a conventional army. In the past, they probably would have had Yoda mobilize levies from nearby republic planets (This happens in Clone Wars in the Water Wars arc when they need to call on the Gungans to reinforce a key front because they just don't have enough clone divisions outfitted for underwater combat) instead of running down to the shop to pick up the anonymously gifted slave army, but they were probably always going to bring an army in.