The worst is the beginning, if youwant to try a different party you need to sit for about 10 minutes to watch all cutscenes, only then you are able to buy your gear and fight. Definitely needs a skip option.
Other fights are not bad, the exception is the second or so fight that the gladiators try to attack Dennaton, it is just as time consuming.
You should try and pay more attention to those dialogues, they are actually quite nice, and Dennaton's voiceover is quite good overall. Not to mention the dialogue that changes for almost every fight depending on whether you have acted as a hero, a villain, or neither of these. I do agree that cutscenes might be too long, but do try to get a little more sucked in the BP2 story, it is actually rather interesting if you do not just do the fighting.
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Other fights are not bad, the exception is the second or so fight that the gladiators try to attack Dennaton, it is just as time consuming.
Used to be that BG2Tweaks had an option to drastically shorten these cutscenes, but apparently that doesn't work anymore in the EE. Annoying!