I hear you, man. I was lucky I have started with version 3, because 4 was unusable to me. Version 6 was also unusable in my opinion. The versions I have used the most in that time were 3 and 5. If I started with 4, I would had probably quit and we wouldn't be having this conversation. LOL
As a program, Poser used to have a pretty bad reputation back in those days, where new versions were mediocre at best. Things only started to pick up after eFrontier acquired Poser and released version 7, which was finally modernizing the program, even if just a little. Soon after, SMS took over Poser development, and THEN we started to see real progress. For example, that's when Poser finally got an UNDO feature - imagine that!
But things were still slow to pick up. More recently, Chuck Taylor migrated from DAZ to take over as Poser product manager at SMS. Since then, we have never seen so much progress in only a few months. Poser 11 is now in SR-4, and remember it was just released last December! Before this, we used to have only 1 or 2 updates a year, so it's nothing to take lightly. Many of my bug reports have already been addressed, sometimes in the same week. That's also unheard from Poser.
Poser and DS are very different creatures. One has this long history of adding new features while still keeping backwards compatibility, while the other is doing the exact opposite, not only with previous versions of itself, but also with the Poser market. Personally, I prefer the way Poser has adopted the Cycles renderer from Blender3D, by making Poser native materials work with it without changes. This means Poser shaders will eventually be added to the material shaders used in Blender3D community - imagine that! I also like the way Poser allows us to create materials that automatically apply to each rendering engine, so users don't have to take any actions about it when they render. Conversely, DS users have to create and apply 2 different sets of materials, depending on the rendering engine (iRay or 3Delight).
There will always be good and bad things about either programs, but since I have paid for Poser, it entitles me to ask SMS for help when I need it. I can report bugs and have technical support. I have even participated in the making of Poser 11 by joining the beta-testing team. Poser also ships with complete documentation for both users and content creators. Those are the things we are not eligible for with DS, because it's free and therefore it is provided "as is". If something is broken, we are not eligible to complain (unless you sell products at their store, and even then, only to some extent). They change things without notice, and the changes are not documented for content creators to be able to learn and adapt.
Nonetheless, DS is free and you can get started with it at any time. Right now I have both programs installed in my production computer, and there is nothing wrong with that. I have been using both programs for years, and I can tell you in advance - DS is not perfect either.