T-ara is a group where the earlier releases are simply better for me. Similar thing goes for most 2nd gen groups, with what seems to be the exception of Apink(seriously if someone told me Apink would be peak consistent on title tracks when they debuted I would've laughed at you).
Meanwhile groups after 2nd gen are kinda weird quality wise, like Twice started horrible at debut and viral hit Cheer Up and have genuinely improved overall. Boy groups are all over the place for me. time of release wise etc...