There's some down here but I haven't tried them yet. I think it depends on too many factors to say. So one time doesn't tell you much. Could be the whole chain got worse, could be just that individual one isn't good, could be just the employees that were working that night. I'm not saying you should go there a bunch just to make sure (as that's obviously silly), but I wouldn't rule out the entire chain based on that. There's plenty of chains where there's one that just sucks and so you don't go to that one (and it sucks if its a place you like and its the closest to you, but it happens).
Lately my pizza cravings have been taken care of by Costco (for when I feel like some pizza but don't want leftovers, so a couple of slices from the food court), and probably Schlotzky's (Wednesdays pizzas are 2 for 1, which they're like personal pizza really, so it'd be filling for just one meal basically and possibly not even that depending on your hunger/craving; they're like $8 too so not exactly cheap, and I wouldn't say they're like all time great, but I like them well enough and there's a decent amount of other options like sandwiches for people that don't want pizza). Then I'd probably go for Pizza Hut during one of their 50% off menu specials or their $5 deal (although that got worse as the pizzas are $6 each now). I was eating Little Caesar's instead of Pizza Hut but we kept getting shitty pizzas from them so stopped (last I got was during their Pretzel crust promotion and it wasn't terrible but wasn't great either).
If I was going on a date it'd be other places like Fired Pie or Mod's or the various coal oven places. If it were bang for buck because you gotta feed 5-10 people then it'd be Costco, then probably Pizza Hut or Little Caesar's.
I should note, I'm not a big fan of true Italian style pizza. Not sure I've had "Detroit style" (have seen some claim Little Caesar's is closest for major chains but it just seems like typical budget pizza for the most part, with the Extra Most Bestest being decent if you get a good one). New York I could take or leave (don't hate it, don't love it). Chicago style isn't my thing either although I could maybe on occasion dig the deep dish but it'd make me not want to eat pizza again for like a year so I tend to stay away. I haven't tried a lot of the more boutique places down here (many are Italian style, or coal fired which I can take or leave too). I also haven't tried places like Sbarro's and the like that are in places I'm rarely at (malls, etc).
All the chains kinda did that when Domino's put garlic butter shit on theirs and fucking morons started acting like that suddenly made their pizza good (it doesn't, unless you're eating true Italian style pizza, leave that as like a dipping sauce or option and not mandatory). Pizza Hut followed suit and I hated it. Then Pizza Hut added other crust options and I liked the Pretzel Crust on the hand tossed (but they kept the garlic shit as the default). Now there's option for some garlic butter shit but its not the default (thankfully). They've changed their crust in the past year and some people hate it but I think I prefer it (the crust ends up fluffier like croissants and stuff, versus like cooked sourdough like texture that many places used to have).