420 calories for a sandwich that large is not bad. One sandwich is *plenty* for dinner. You can even toss in the bag of Baked Lays for a total of 550 calories for dinner, which is entirely reasonable and fits well into a calorie-restricted diet.
Moreover, if you get the Turkey pesto without the pesto sauce you're knocking off 80 calories and 8 grams of fat, leaving the sandwich at 340 calories with 8 grams of fat (I'm not sure where those 8 grams come from, but that's what Wendy's says). Add the chips (or, preferably, some fruit or something) and you're looking at 470 calories for dinner. Or 340 for lunch.
My usual breakdowns are about 150 calories for breakfast, 250 calories for lunch, 500 calories for dinner, and 400 calories of fruit and snacks spread throughout the day.
There certainly are better fast food choices out there, but the Frescatas are large, filling, and really really tasty for not too many calories.
BTW, believe me, I know how many calories they have. Have you looked at that spreadsheet I posted, where I've accounted for every single calorie I've consumed since April?