It depends.
DA2 focuses on:
- the protagonist's personal story (instead of an ~epic~ world saving thing like DA:O and DA:I are doing)
- story events instead of exploration (if re-used environments bother you, you will be annoyed. I didn't mind.)
- more action-y combat than Origins had. However, Inquisition goes even more action-y...
- you do notice it's a rushed game at some points, yes
I'd personally say yes, 'cause DA2 is dear to my heart. But don't go in expecting Origins from DA2, it is not that and will disappoint you if that's how you approach it.
DA2 tries to have a personal story focused around a single city with conflicts developing over time. It discards exploration in favour of lots of quest cutscenes (= opposite of Inquisition, essentially). Going from DA2 to Inquisition might be a little jarring though, because they're trying to do opposite things.
If you find it cheap somewhere, it's absolutely definitely worth it. If you don't find it cheap, then it depends on what you want out of it, I guess.