Not all expansions in an MMORPG are regarded as great, usually. There are hits and misses.

We already have had to say "it's great after ARR" for years. Not that ARR is really bad, but it's long been controversial, in part mechanically just because we have 2 abilities and the tedious work of unlocking everything, attuning to aetherytes, unlocking mounts and being overwhelmed with blue sidequests. But excluding the patches, the ARR story itself, while good at lore building, it's overall your basic good vs evil story that some might regard as simple.

I don't think it's so bad that it needs a rewrite or something. There are other "meh" parts of the MSQ, such as the patches of most expansions. Y'know, going to install a new government in each region where we toppled someone is our most typical patch story and that's more or less what we're doing at Solution Nine right now. It's important for the story but I've lost count of the amount of times we've done it.