You can definitely win in Slingo® Casino and we see that every day.
Within a given lobby (for example: Slots, Slingo® or Table Games), the odds are similar across the various games. Typically it's only the art, music and bonus rounds that vary.
We know it can be frustrating when the odds are not in your favor, but odds tend to even out over a long period of time. If you continue to play no doubt you will see that borne out.