Base Set theme decks were awesome ! You got a decent playable holofoil, plenty of good trainers and energy !
Nowadays the theme decks come with like 1 good supporter, some filler Pokemon and a barely playable holofoil for tournament play. They're almost as expensive as a EX tin which is way more beneficial for tournament play.
If you're looking to play casually with a friend to learn the game and basics, you can pick up 2 and have fun. That's how I got back into the game.
I would second donavannj's recommended trainer kit and grab 2 of them, meaning you have all the basic energy you'll need.