Probably no one cares, but given I own a few Pentax camera's I thought it would be fun to rate them. I own a BUNCH of Nikon, Canon, Olympus and Minolta cameras as well, so some of my comments are referenced by those brands build quality/features.
Spotmatic SP II, Spotmatic F 7/10
Classic styling, extremely well made, very reliable mechanically. All 4 Spotmatics I own have non working meters, but none have ever failed mechanically. All Pentax owners should probably own at least one Spotmatic! Downsides compared to newer models are the viewfinder which can be a bit muddy in low light.
Spotmatic ES 6/10
Bit of an odd duck - classic Spotmatic build, but lacks manual shutter settings below 1/60th of a second.
K1000 6/10
K mount version of the classic Spotmatics. They seem to have come down in price, but I have always thought they were a bit overpriced. I would rather have a KX
LX 8.5/10
I own two - I have a love hate relationship - first one developed the sticky mirror issue and cost a lot to get repaired. Lovely Viewfinder - probably the perfection of the 35mm SLR design in many ways.
MX 8/10
So much to love about the design - all mechanical, and innovative VF display of shutter speeds.
ME Super 8/10
This was my first ever film camera, and I loved shooting with it. I no longer own the one I had as a teenager, but have picked up a few over the years. Lovely design and great features - excellent VF and silky smooth film advance make it a pleasure to shoot.
Super A 7/10
An 'KA' mount version of the ME Super - added program mode. Lovely to shoot, but have had a bunch with mechanical failures so I am marking it down for that.
P30 7/10
Seems like a solid design, but I feel its a step down in terms of build quality from the previous models.
MZ-M 7/10
This is my secret little guilty pleasure - light as a feather and so much fun to use. Has a plastic lens mount and a small VF that is not as well suited to MF as the older models, they cost almost nothing.