Liszt - too flashy for my taste.
Impressionists - just don't care for them.
Not trying to attack your opinion or anything because I respect it 100%, but more making a general statement. I just get a bit peeved when people say they don't like Liszt because he's too flashy. Yeah there are many pieces by him that you could make that statement about and while most of those pieces I tend to like, I would understand. But he wrote a huge array of first-rate pieces that I just don't think you can say that about (although with you especially I don't think I need to tell you that as you seem knowledgeable about repetoire, especially solo piano). But to make a list of these pieces off the top of my head, being careful not to include any works that could in any way be called flashy:
The entire Années de pèlerinage, not including Orage, Vallée d'Obermann, Après une lecture du Dante, Gondoliera, Tarantella, all of which are good pieces (two masterpieces) but not to everyones taste.
Half the Harmonies poétiques et religieuses, and that's being very careful. The half i'm not including includes pieces that are either good pieces or masterpieces that could possibly be called flashy if they are looked at the wrong way, like Bénédiction de Dieu dans la solitude, Invocation, Funérailles, Miserere, d’après Palestrina, Cantique d’amour, Pensée des morts, but honestly I don't think any of those can really be called flashy.
Romance in E Minor.
La lugubre gondola II.
En rêve. Nocturne.
Hungarian Rhapsody No. 5.
Christus Oratorio, The Legend of St. Elisabeth, Via Crucis, and pretty much all the choral music he wrote.
Poème symphoniques, No. 4, Orpheus, No. 8, Héroïde funèbre, No. 10, Hamlet, No. 13, Von der Wiege bis zum Grabe.
For the life of me, I cannot understand how any lover of classical music doesn't adore Mozart.
As for Bach, I too had a difficult time with his music for a long time. Of course I was aware of his reputation, but I couldn't get into him. Then I listened to his Mass in B Minor. Such a great work. So I decided to try to gain entry into Bach's rich world via his Cantatas. I began ordering the Monteverdi Choir recent releases of the complete Cantata collection, and listened to them as I drove to work, everyday. They hooked me! Every cantata has something magical. That began my love for Bach. He is my desert island composer.
For those who dislike Bach's music, have you tried a HIP recording of some of the Bach favourites? Me think HIP do far greater justice to Bach's work (Baroque in general, too). And if you have, and still dislike Bach, well ignore what I have just wrote.
Hip, schmip - too often perfectly made and perfectly boring. A miracle when he wrote every day and about 1300 works that a handful are inspired. Stiff counterpoint like the ticking gears of an 18th century chronometer. I like crossword puzzles, and everything falling neatly and cleverly into place - but I do not consider them 'art.'