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Taking a quick look at 1995 -- first retro year I looked at -- here are the 3B's sorted by wRC+.
14/18 of them have indexes over 100 (Thome, Bonilla, Chipper, Ventura, Boggs, etc), and there are seven stars over 120.
17/18 are 90's or better! The 18th was Todd Zeile, a lifetime 250-homer man having a down year.
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Here are the 2B's that year, sorted by wRC+. Less than 50% hit 100 on the index, there are only two good hitters (Knoblauch and Biggio), and there are many terrible hitters who started for their teams (Lemke, Lansing, Rey Sanchez, Brent Gates, Jody Reed, etc.).
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I could be wrong, absolutely could be wrong, but that's the kind of 3B and 2B population I grew up with, that 1995 set.