I disagree, you can specifically rate clerics lower for that reason. Any class is capable of soloing given the right conditions(rogues have solod to 60), so that needs to be factored in the overall equation.
When talking about overall power, no class is excluded from any one area and you need to consider every aspect of the game. Solo, duo, trio, 4, 5, 6 man groups, and raids. Clerics will take a hit because of solo, but they are a much better duo/trio class than rogues, so they get more points for that.
When you evaluate every aspect, mages do pretty well. Rogues do great in bigger groups & raids, but overall they fall pretty far down there with rangers & wizards.
If you think that OP/UP means giving rogues an exclusion in the solo scene since they weren't necessarily intended to be solo classes, then we are having 2 entirely different discussions
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Edit:
https://wiki.project1999.com/Loraen%...election_Guide
I think Loraen did a pretty good job at rating each class overall. I'd probably tweak a few things since he made this in Kunark era, like SK/pal can solo a lot better than he gives them credit for, but overall I think it's pretty good, and as you can see, magicians are pretty high up, because they shine in almost any situation.