I agree with the sentiment expressed here. One of the things I worried about before we released DP1 was that we lacked game-modes that really demonstrated what MTA could do. As others have said, MTA can do pretty much anything, but people insist on playing freeroam! Of course, we can accept that people enjoy freeroam, but a large number of people (me included) do not. Unfortunately this is a vicious circle of sorts - players try MTA, find that it's pointless freeroam, dislike it and forget about it. What we'd like them to do is to come along and script what they would want to play, but of course the barriers to entry for scripting are much higher than just playing.
So, if you can script - consider making an interesting mode. Don't worry about perfecting it, but pick something different and try to get some aspects of it working and show it off. Get together with others and work on something together. We wanted to develop a C&C style mode internally but we didn't have the time - I'd personally love to see that.
Equally, if you're a server admin who is running a script, please make it public. It damages MTA to have every server running it's own gamemode and if people stop playing MTA, we'll stop making it.