I like Del Taco a little better than Taco Bell. I usually get a Del Beef burrito from there and add some extra cheddar when I get it home. Their street tacos pretty good but a bit pricey compared to my local taquerias. I haven't had a burger from there, but I have had their fries, and they are good.
I've only had frozen supermarket White Castle sliders which I would hope are a poor imitation of the real thing because they aren't great.