Also please describe your definition of reliable vs unreliable, maybe I don't understand your view of it, maybe replacing coils at 60-80k miles is normal, although GM gets more than twice on average out of theirs. Maybe it's common to replace valve cover gaskets at 50-75k miles.. I don't know..
Reliable..... Not leaving me at the side of the road. Not needing a plethora of non maintenance items. Going more than a year without basic maintenance. I would MUCH rather replace coils every 50K-100K miles as opposed to a carb rebuild every 15K or so, a tune-up every 10K-12K (points, plugs, condenser, rotor and cap), wires and coil every 15K-20K, CONSTANTLY having to fine-tune the carburetor, making sure the oil level was right.... "little" things like that. I used to be under the hood taking care of something at least once a month. I pretty much raise the hood now when I'm bored and want to make sure the fluids are still full, change the oil, just give a general once over or do something like my engine cover mod.