Spitfire Studio Woodwinds, and SSO, and Percussion, and almost everything I’ve ever bought from them. Cumbersome programming, weird legato, persistent intonation issues. SSW is a particular disappointment. Not great sound, often unusable dynamics.
Seconded 8Dio. I used Adagio for a while but it was just too much trouble chasing inconsistent attacks, intonation problems and strange programming. Sounds pretty good but hate using their strings and the solo brass I have. Their poly legato is half-baked. (I wonder if Afflatus is any better.) I use Lacrimosa with a degree of success though I’m not doing complex things with it. Thought it was funny to hear Troels talking about syllables and saying “nobody cares what the choir is saying”.
Berlin Strings. I despise Capsule - and it’s such a pig scripting-wise and RAM-wise that I could not have things all online in the way I wanted to. Can’t get away from the length of the Teldec hall either. It’s full of interesting things but not for the way I want to work.
Cinematic Studio Strings and Cinematic Studio Solo Strings. Thought they would speed up my workflow because they are simple and seemed to sound pretty good in the demos. But the delays are irritating to me. And on my system, next to other libraries I use, they sound grainy. And the pizzicati are inexplicably reverberant, so I don’t use them.
EW Hollywood Strings. Far too cumbersome when it was released. And it hasn’t aged well to me.
In general I’m being let down by stuff that isn’t modeled. Crossfading dynamics is often a drag in conventional libraries, and programming or recording issues get in the way, and they often lack agility.