I'd further suggest that strategy is about planning the method of victory while tactics involve the execution(planned or otherwise) of the strategy. To say chess or warcraft doesn't involve strategy is doing both a discredit (and to suggest as someone did that strategy didn't exist until the 20th century and the presence of airplanes is absurd).
In chess, for instance, playing a player that favours using their bishops, strong flank attacks and a rapid flow of game, you might attempt to clog the flanks, exchange for their bishops at any opportunity, and to slow the pace of the game down by careful and deliberate process. That's your choice of strategy. Moving your pawn from g7-g6 might be a tactical move to accomplish it.
In warcraft, there's similar considerations. Maybe the map has precious little gold on it and your strategy is to secure all the gold mines, with as much force as is reasonable, as quick as possible. You enter the game and then choose which blend of forces will be sufficient to achieve your strategic goals.
I certainly can understand some people knocking on warcraft 3 because they don't care for the pace of the game (I personally find the pace too rapid to make the key appropriate decisions, and though i enjoyed the game, it isn't a favorite), but please don't bash the game on the basis that it lacks strategy because it obviously does not.