It is a funny situation with osCommerce, and I'm sure that if you put it to some Zencart and CRELoaded evangelists that their system was based on osCommerce, they too might get the hump, even though Zencart and Creloaded are derivatives of osCommerce.
We are in a similar, contradictory sounding, situation too. We wouldn't normally recommend that small businesses go the
DIY osCommerce route, but we think that our sitebuilder solution which has our
custom version of osCommerce as a shop section of the site, is a good solution for some businesses.
Sometimes it is not the underlying ecommerce platform which is the issue, but the visual look of the shop, and we have tried with our solution to make client sites look different to the usual 3 column oscommerce shop websites out there. To that extent, our ecommerce sites, which use osCommerce, might end up looking less like osCommerce sites than other sites built using other ecommerce systems! (in some ways even Amazon has a similar look and feel to default osCommerce - or is it the other way around)
If anybody is looking for UK hosted managed solutions based on custom improved, not default, versions of osCommerce or its deriviatives, then
www.paceretail.co.uk and
www.rentacart.co.uk have a ZenCart based hosted solution, and we,
www.awebapart.com, have a partial (part sitebuilder, part osCommerce for the shop section) osCommerce based hosted solution.