Why do I get the feeling this is going to turn into one of those "good kits are bad for your skills" threads?
To be honest, I've never been able to understand that rationale. No matter how "good" a kit is, there are always plenty of areas on any build for a modeler of any level to "develop" his or her skills, be it the detailing, painting, decaling, weathering, or whatever.
To be even more honest, it is in fact primarily the most basic of modeling skills (filling seams, cleaning flash and parting lines, gluing pieces on straight and true) that truly bring the lesser kits up to the same level of quality as the better kits, at least as far as first impressions go. To varying degrees, these same skills must be employed in even the highest quality (and priced) models, so I don't see how a good kit robs of us anything.
As far as detailing goes, it's up to the individual how far they want to take it. You can look at it two ways: work your butt off just to bring an undetailed kit up to the standards of a higher-priced but better detailed kit, or take that same well-detailed kit, apply the same amount of effort, and turn it into a stunning, intricately detailed masterpiece.
I choose to attempt the latter.
By the way, I have to disagree with the statement that the Tamiya Walker Bulldog "sucks"...it's a great little kit! Old and simple, but not "bad" at all.
Here's mine, built 6 years ago, before I even knew what an airbrush was:
"Suck" is in the eye of the beholder, I suppose!