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I have to say that I have no little experience with CMSs other than XOOPS
as for the strengths and weaknesses:
Strengths: There are simply so many modules to choose from, bugs are generally fixed quickly. Active community for solving problems that users encounter
Weaknesses: Object oriented code used in XOOPS is difficult to modify without object oriented php skills (which I for one, am lacking).
Currently, many people cannot decide which version of XOOPS to use as version 2.0.13.2 is considered more stable than the latest 2.2.x branch. I agree with this which is why I have switched my site back to 2.0.13.2. Some people do not agree with this. (no offence intended to core devs!)