Most modern rolling stock is let down by the passenger cabin.
Look at the Aventra family. The 720 is absolutely horrific, and that's purely because of the 3+2 seating: the seats are too narrow, the aisle is too narrow, the legroom is non-existent. I've not been on a 730 but I presume they are more like the 2+2 bays on the 345, which are really very comfortable. The Aventra platform is, underneath it all, a good train.
Same with the 700/707/717 Desiro City trains. The actual trains are good trains, Siemens make good kit. But the seating is also absolutely horrific, narrow seats wedged into the wall then a huge massive aisle. The 707 not having a toilet was also a bizarre choice to make on a modern train.
I like the 195 and the 197, the only trouble with both of those trains is that they're not big enough. I know that the 195/0 at 124 seats is, nominally, a small capacity upgrade on the 142 and 144 units it replaced, but it is still too small. Same with the 197, 116 seats (due to the aborted first class/premier standard cabin) simply isn't enough. Weirdly, though, I'm more ambivalent about the 331: better than a 323, yes, but not a patch on a 333 or even a 321.