I can honestly say as an ordinary user, someone who doesn't create content or modify it in extreme ways, that I have found it very, very rare to come across "glitches", and those that I have come across usually seem to be caused by third party content.

As to the ui, many poser users have stuck with the program because of the ui. Whether something is intuitive really depends on past experience. Someone who has always used windows pc's will find somethings on a Mac counterintuitive that to Mac users are completely intuitive.

Sometimes watching lots of tutorials can be counter productive. To an extent it will really help if you just try things.

For example, in other posts you have said about posing and how LaFemme doesn't work as per the tutorial. Just clicking on a body part, such as the abdomen you will see dials in the parameters window labelled twist, side to side and bend. Just moving the dials will do exactly what they say.

Yes there are things that are not intuitive, for example the difference between adding clothing to a seen by double clicking or drag and dropping, but once you find out they rapidly become second nature.

So I would advise just play, stick to the pose room and the content library, and just ask when you have questions, to get a basic scene with provided content is much easier than you might now believe. .