That’s the thing, every deck should have at least a generic
game plan. Ramp early, draw cards, answer threats, and find some way to win. Most (and by most I mean pretty much all) of the planeswalker precon decks are pretty bad, lacking in all of the listed departments. If you want to play a fairly strong deck on a budget, but still be fair enough for casual play, I suggest playing Pauper. Cheap format, easy to find cards, and still with enough power to be fun. EDH/Commander is also very casual if you are into that. Hope this helps!