Well, first of all, WordPress itself is a whole collection of "scripts", so you are running scripts. This is only relevant in light of your later comments.
Friend, if it is not "live yet" and it is "exceeding system resources", I can assure you that there is either something seriously wrong with you particular server (which you should report and get fixed) or, "You're doing it wrong."
A WordPress site not being "live" but being broken already is not at all like "blowing an engine on a car you have never turned the ignition on before" ... I assume you have "tested" it, right? That is more like "blowing an engine on a car before you take it for a drive on the freeway, because the first time you turned the ignition on in the driveway, the engine was defective or you did it without putting any oil in the engine!"
There are, literally, tens of thousands of WordPress blogs hosted on Dreamhost that are working fine; if yours is not, then you probably ought to find out why that is the case.
I am completely baffled about the relationship between your first statement, this statement, and the statements that follow. Outages happen at all hosts, and of course a site that doesn't work on a host that is "out" may very well work on a host that is not out ... what kind of a tests is that? It sounds to me like you have more than once source of frustration and more than one problem. You have a sites that you say are "down" or "out" more than you can tolerate, and you have a WordPress installation that is "broken".
I assume you must be talking about WordPress.com, as WordPress.org does not host any "user" sites. This is probably indicative of how little you understand about hosting, scripting, and WordPress in general. So, assuming that you are really talking about WordPress.com (which hosts blogs) and not WordPress.org (which provides the software for you to host your own blog on your own, or another's, server), there are many many reasons why one might work and the other one might not.
One of the primary reasons is that those "hosted" WordPress.com blogs do not let you "do it wrong" when it comes to installing crappy/broken themes, installing a badly written or defective plugin, or simply installing and trying to use too many plugins or plugins that overload your server's resources. DreamHost offers a similar "controlled" environment with their "easy" one-click WordPress and ZenPhoto "hosted" versions. These easy" versions differ from the "advanced" one-click installation versions in that the former is a "controlled" environment and the other turns you loose to screw it up!
There is probably something "just not right" with a host the size of DreamHost's at any given time, just as that is true with any other large host; these are very large installations and stuff breaks and has to be tweaked all the time. If your site(s) live on the Blingy cluster, or even on the Spunky cluster (though to a much lesser degree), then the last month has been pretty rough, I agree.
That does not make the whole service "unreliable" any more than a particularly problem plagued airport makes an airline unreliable... I've been at DreamHost since 1998, and I guarantee you that I have seem for more "problems" during that time than you have experienced in the amount of time you have been hosting here.
The difference is that I have the benefit of long term experience with hosting websites, with DreamHost and other hosts, and I know how to recognize the difference between a "problem" that can be identified and ultimately resolved and a host that is just "generally unreliable."
All that said, if you are no more interested in getting to the root of why your WordPress site consumes too much resources while it is still in testing mode than to just say, "it's the host," and "I can host a WP blog on Wordpress.org and have no problems" instead of trying to figure out what your problem is and what is causing it, then you should probably try to talk WordPress.org into hosting your site for you (or just go run your WP blog on WordPress.com - which is what I believe you are thinking of) or try the DreamHost "easy" one-click installation of WordPress, which you are unlikely to be able to bork.
You could also ask for help here to try to figure out why your WordPress site is so messed up, but I know that it takes some research, investigation, and effort to ask those kinds of questions (and investigate the answers you receive), and that it is far easier to just complain.