gibson still exists just because les pauls and SGs are some of the coolest guitars around. period. i played some unplayable and very costy les paul and have got a "cheap" (you know the guitar of the week story...) les paul that's nearly perfect and a "cheap" SG (the same) that's very, very good. quality and feel vary on a wide range...
i'd buy (and i did it) an ibanez or an esp on the web (i bought also an epiphone without having ever tried it and it looks like i was quite lucky) but i'd never do it with a gibson...
it's mad that a 3000 € gibson made by much vaunted usa craftsmanship can be much worse than a 300 € ibanez made in indonesia (that comes with a complete QC check signed by the VARIOUS guys who actually did it), but these are the rules of the market... if you can sell a name you don't have to worry about the actual quality.
fenders are no different, i don't like strats (and i'll never play a tele even if i'm sure they're great...), but played some (and owned one!), and quality is quite stochastic...