I'm known on this board for being a contrarian about opening study. I'm not advocating that beginners memorize a lot of lines, BUT...I see a lot of useless, warm toast advice like "just play good opening moves." I've beaten more than my share of players over the board who did just that because they didn't have a clue about openings. And I've lost my share for the same reasons.
There is a strong credo in the chess community that warns people off studying openings...even though most of the doomsayers have libraries groaning with opening books. I also think studying tactics in isolation is a waste of time, unless you really like that sort of thing...it's VERY rare that you will see a given pattern in an OTB game, once you get past the usual stuff aimed at strict beginners.
>all you can do is wait for your opponent to blunder and then call it tactics when you take advantage of his mistake<
Excellent comment. Too often the canard of "study tactics" overlooks the fact that most of the Great Middle (1200-1700) find tactics through opponent blunders. That's great, but it's not what books filled with hundreds of tactical puzzles are referencing.
I maintain that you are better off studying your favorite openings, the positions that result from them, and using something like Silman's imbalances theory to formulate a plan. 90% of your wins will come through better positional play and a good plan, as well as solid endgame technique. Only rarely will you win "by tactics," and like Phelon said, most of those will be from opponent blunders.
Okay I disagree with you about the opening study, I think that that's a trap a lot of weaker players, such as myself when I was lower rated, fall into before they are equipped to understand openings. If you can't understand openings, dont memorize variations, simply don't study them until you're stronger. Also I think you really should study puzzle books about tactics, they can even be easy puzzles, but study them hard. Study them to the point where they are ingrained in your brain and you know every answer by heart. Once you do this you will have amazing tactical vision, and can see many possibilities and tricks others can't.
I agree with you completely on the "90% of your wins will come through better positional play and a good plan", however the final culmination of great positional play throughout a game is usually a beautiful tactic to finish off the game. That is what I mean by real tactics, and not capitalizing on blunders. Also sometimes your tactical brilliance will just net you a lowly pawn, and you need to use your endgame skills to convert the advantage like you mentioned. So all in all I mostly agree with you, just not about the tactics and openings.