Also: my compy doesn't support shaders, or anything that fancy :(

so it should look better to you.

Well, what should I say ...

• Give your map a name - unnamed is not really a good idea
• Do NOT bind keys in your maps cfg - this can be considered bad style.
• There is a bullet entity outside of "normal" space ... you should remove such errors before going public
• The ammount of ammo is ridiculously high
• The ammount of geometrical detail is ridiculously low
• Please read my HowTo on packaging stuff for public release.
• But - don't feel disheartened - we all started mapping once. Keep at it!

All in all, I'd say you should definitely try to model some small bits first before going for a full map.
Get the feel for the editing possibilities; this usually doesn't result in something to show others, but will help you (someday) get there :)

Its not a question of hating or loving it. This map is just not finished yet.

The ammo-count is way to high, you should keep people running for it, especially for the more powerfull stuf, virtual wealth is a game killer. Keep players starving for ammo, don't let them die but keep them running.

And there is just not much to see, there is no theme, not even an abstract one. Is it gameplay that is going to dictate design or do you value design that pleases the eyes?

And place the carrot at the end of the stick, powerups, quaddamage and the yellow armour so be at difficult to reach places where everyone can have a shot at you, but it has to be so tempting to have a go at it.