Do you slam the spacebar during dialogue?

It depends. On my Vanguard, who is level 39 and my main, I never do. On my lower level characters, I sometimes turn on sub titles for the quests and spacebar after I quickly read for the side quests I previously did with my other characters. I never spacebar through class quests.

Same here.

Never

The way the stories and quests are presented is one of the best things aobut this MMO

But what if everyone in your group now is has "Waiting on Other Players" on their screen waiting for you?

I generally listen to everything if it's a quest I haven't done before (or one I've forgotten) and the dialogue is in English. If it's one of the alien languages I'll read everything but I'll spacebar as soon as I do rather than wait for them to finish talking in Huttese or whatever, and if it's a droid talking in beeps I generally hit escape and replay it a couple of times to try to catch what he said since they typically scroll the text in those faster than you can read it.

If it's a quest that I've done recently enough to remember with the same class then I generally just spacebar through it, though if I'm playing a different class I'll at least read it because they often change the dialogue based on your class. For instance, Imperials tend to talk to a Sith a lot differently than a nonhuman Bounty Hunter.

I'll normally ask. In Esseles, for instance, I'll say "Did you guys want to spacebar through for a quicker run, or watch the cinematic?" If I forgot to ask, I sometimes space through the first couple conversations just to see what everyone else is doing. If I have to wait because they're watching, I'll just watch the remainder.

beside the class quests, the quests are the same on every character so i smash my space bar threw leveling. now its all wobbly

I don't spacebar usually.

But if I hear an "Umpa Wumpa" or "Mee Wanna Wanga" and then I slam it as fast as humanly possible.

I have a ton of both Republic and Imperial characters, but it's plainly obvious that they spent so much more effort on the Imperial storylines. On Republic side it seems they ran out of money for voiceovers and everyone and their mother speaks Huttese, or Sullustese, or whatever alien language. On Imperial side everyone's a British human so it's all fine and dandy.

I'd recommend not spacebarring for any conversation that's actually held in Basic. If you like paying attention to details on every alt there are variations in what they say, usually depending on your class but occasionally it can also change depending on your race or gender. I think a few NPC's even acknowledge if you're a Chiss?

I find the game is even more enjoyable if you turn off subtitles, that way you watch the characters' faces more rather than reading the text and being tempted to spacebar :P

I don't group with people who are twitchy.

Seriously, the folks I group with are perfectly happy to dither along as I do so it's not an issue.

Yes, I slam it, and not just on the millionth Esseles run.

Class stories I often read, but bozo-standing-there stories, not anymore. Even the first time.