Corrie lost a lot of its identity by the late 90’s. I guess you can look back and say Julie Goodyear’s exit as Bet in 1995 was the end of classic Corrie as we knew it.
The show floundered throughout 1996, which led to a massive overhaul in 1997. The show became more sensationalistic and less about the vivid characters and community that had defined the show before then. That shift just continued on. They had some great years in the early/mid 00’s, but that classic Corrie sensibility was hard to find by the mid 00’s.
But, it’s heaven to revisit just about any episode from the 60’s through mid-90’s. Corrie just had these vividly drawn characters that you couldn’t find anywhere else. Even if the plots weren’t always the most exciting, the characters were often exceptional and you couldn’t stop watching or caring about the ones you found most endearing.