This has been a great read. In the spirit of the original post though - some of you guys need to use less generalizations.
Like the "all diezels" or "all engls" or "all H&K" people. Name the ones you played, and if you say you played them all:
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As for me, I'll give a little story on each one because it's not that these are BAD amps, it's that I had high expectations for them and was let down. There are other amps I think are worse than these, but these are the ones I got hyped/excited about only to find out they were mediocre.
1.
Diezel VH2 - I still want to try a VH4, but I got this thing locally for an insane deal. Idk, it sucks.
2.
ENGL Retro 50 - Someone told me I would like this if I liked Splawns. I should find that person and punch them in the face.
3.
Laney AOR50 - picked this up way back when I couldn't afford a JCM800. $350. Even for that price, it was a waste of space and I sold it off. I actually wish I had it back now but more because it was unique and my expectations are curbed. At the time I thought it was going to be a budget JCM800 because that's how it was described so often online... clearly by people who have never owned one.
4.
Fender Supersonic 100 - I loved the SS60. Played a SS22 in a store and wanted to take it home, then saw this online and figured hey, more is better! Nope. Especially compared to the ProSonic, what a let down.
5.
Mesa Roadster - I already had a Rev G and a 3ch Triple at this point so when I got this it was another case of expecting the same kind of sound but "more." It had less gain, was somehow even looser, the extra crunch-ish channel didn't sound good to me. Huge flop... hilarious footswitch though.
6.
Orange Dual Dark - I was on the Orange hype train, starting with a Thunderverb, then Rockerverb, then I kept reading about how this thing was a Mesa Mark killer and would do high gain metal like a boss. Again, not a bad amp, but especially for the price I was really disappointed.
7.
Egnater Renegade - I played this amp several times in stores when I was kinda new to guitar playing. I loved the tube mix idea and thought it would be the perfect 80s rock amp, couldn't afford it, then forgot about it for a decade. Bought one years later and thought it was incredibly weak, too smooth, boring sounding overdrive. Good cleans though but that's not what I remembered wanting it for.
8.
PWE EH3 - I got a PWE EH (original) on ebay and thought it was just the tits. It covered a lot of ground so I was excited to see what was next in the PWE world and picked up the EH3. He really went backwards on this one IMO, it has fewer tubes, less gain, less definition, less punch. I know some of these were custom orders so maybe whoever ordered mine picked some weird stuff?
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Honorable mentions
Mesa TC50,
Marshall VM, and
Rivera KR7. I didn't have super high expectations for these so they don't really belong in the disappointments category, but I don't really like them.
IMO, amps like the Peavey Valveking don't belong in this thread. Did you really have high expectations for it? Not much of a disappointment unless you are totally unrealistic.
Also I'm surprised to see the Henning Cherry Bomb around here a bunch, I've heard mostly good things elsewhere and would love to have one. Someone who has one they hate, PM me in like 3 months.