To be honest I don't necessarily see this as a bad thing. I like a lot of Rowan Atkinson's work but I absolutely hated Mr Bean. Something about watching someone be inept in every possible way causes me a huge amount of stress and isn't something I'm able to derive any sense of enjoyment or fun from. If there were more episodes it might have become more of a cultural meme (like, say, The Simpsons), which I'd find really hard to deal with.
(This doesn't always follow, of course. The UK version of The Office is only 12 regular episodes plus a couple of specials, yet it's impact is still very much felt - at least in the UK - so I don't necessarily see there being a simple correlation between quantity of material and cultural significance. As much as the US series is also excellent I don't think it carries quite the same iconic status or cultural weight here even though there are a lot more episodes - obviously it might do in the US.)
(This doesn't always follow, of course. The UK version of The Office is only 12 regular episodes plus a couple of specials, yet it's impact is still very much felt - at least in the UK - so I don't necessarily see there being a simple correlation between quantity of material and cultural significance. As much as the US series is also excellent I don't think it carries quite the same iconic status or cultural weight here even though there are a lot more episodes - obviously it might do in the US.)