It certainly is. When I used the EMR Angel set last December, it was probably the first time I'd used an IC70 in a HST Vehicle since the end of the FGW Barbie Era. And I remembered why they should have stayed in the past. I'm a reasonably tall person, and I'd forgotten what it was like to stick my head against the headrest and feel the top of the seat in the back of my head. As well as the equally irritating fixed arm-rests and the table that felt like it was a foot away from your lap. Give me an FGW or ScotRail HST every time, and a second best case scenario of the ex EC HST set (the ones with the modified bases). IC70s have had their day, that's for sure. It was rather nicer to come back in the ex GW 402 buffet coach instead, both to bring back memories of travelling them in the south west, and to avoid the IC70s in standard again. The pseudo GWR GC ones weren't bad, but I can sink into the Primarius more.
Another nomination for the worst category in my opinion is the prototype GWR refurb 166205. That didn't take long to look dirty or feel tired either! (Suffered the same issue as LA15/16 for the reasons I've outlined in that post above).