Oh I thought I also said something about the physical size, but it seems I didn't... ed:
I'ts not very big, but thats because I wanted to make a map on wich you wouldn't be running around, looking for enemies for EVER when playing with like 4 or 5 players. Spawning points allow up to 24 players though.
About the exploring - I didn't want to create too much hiding places. And well, about the objective: at least it's not a Flak cannon you have to blow up - but a 15 cm omaha beach kinda gun

- I know that kinda sucks, but I'm trying to work on objectives that are more fun... (see my running Ai in multiplayer thread) Maybe I'll modify this map later with a cooler type of objective.