I wouldn't say buggy. Quite playable. Much more controlled. Easier.
Takes some getting used to - for example to being unable to redirect spells - and enemies move around between cast start and finish.
Slower, heavier hitting attacks tend to be better. Although it's easier to land timely Interrupts also.
And spells
Typically a single spell is capable of achieving more then a single/dual attack.
A bit slow at times. The fact that some enemies are bullet-spongy is emphasized in Turn Based.
Good times for a nuker, with damage on ray spells and persistent aoe spells from their entire durations being "compressed" into 2-3 ticks.
Good times for a Blood Mage, who can (almost) fully buff as Free actions and instantly recover all these spell slots as Blood Sacrifice Free actions.
Playing a Spellblade nuker, I'm very happy with the changes to persistant damaging spells (which became so strong however, as to make traditional nuking staples, like Fireball, Blast of Frost, Torrent of Flame and similar - largely obsolete). Where's the Balance? :D
However for most other classes, I'd consider whether such slow, methodical gameplay vs sometimes bullet spongy enemies is what I really want.