I never had a guitar that I did'nt like, but I've had a few that drove me particularly nuts..........
1985 Kramer Focus 3000
If it were not for this lemon of a guitar, I would not have EVER leanred about guitar repair. Within the first month, I had to go from 009-042 gauge strings to 012-056 to keep from breaking them all the time, and even then, I eventually wound up moving up to my own custom set of 014, 018, 024, 034, 044, 060 to keep from breaking strings, and that was the only time it went one week without winding up with only 4 out of 6 strings left on it.
On top of it, the bridge humbucker (the original) was badly designed and vulnerable to having the coils cut by guitar picks, so I had it replaced with a Schaller Floyd/Rose Sustainer for $20 during the last few sighing breaths of grunge.
After that, the middle pickup just gave up out of the blue, and then I had to have a switch replaced, and all kinds of other crap. Then the bloody locking nut stripped out, and the Luthier at the store, feeling sorry for me, did a bad/good thing and gave me a Stew Mac catalog, and the next thing I know, I'm adding and upgrading parts like a madman on this thing. By the end of the next summer, I cut my own pickguard (in the picture), replaced the original pickups with EMG select, and replaced the wiring with most of what you see here, filed the upper frets down. 2 years ago I added the neck humbucker, and for the longest time I had a Gibson branded Kahler held on with bolts from a Briggs & Stratton Lawn Mower engine, which I just swapped out because 10 years after THAT swap now it won't stay in tune again, so I put a Floyd Rose II trem I had laying around on it...sometimes I just feel like throwing a Mustang trem on it and being done with the locking trems on this thing, hence why I only use it occasionally. If it were not my first Electric Guitar, it would have been out first sign that it needed all that work. In the same amount of time I owned my Jag-Stang, I had already done about 2000X in repairs, and replacements, the Jag-stang is still pretty much original except what I got that was changed, the Kramer has already lead 20 lives.
Here's the retarded part, I bought another one on my 10th year anniversary.....thankfully it has not been half the problem this one was, but hten maybe that's because I'm usually playing my Fenders now.