Space Opera or Hard Sci-fi?
Well, it's not Lensman nor Star Wars...
BUT, In my mind, at least, it is Hard Space Opera... Epic storylines, grand setting issues, chandelier-swinging swashbucklers-in-space, with realistic physics.
Characters die. Often in non-heroic ways, but it really is more star wars than 2001...
I dislike certain rulesets for various reasons.
CT was not enouguh to define a universe. Not quite CORPS' "Tabula Rasa", but still a fairly generic set of rules.
CT+ (Bks 4-8, supps 1-13): still realistic in tone, but allowing for grand swashbuckling.
MT: my personal favorite. But it was Errattq Cenrtal...
And didn't make the one reality rule I would argue was most essential: Armor for vehicles took no space.
TNE: Too many "reality rules" that didn't simulate reality. The combat system was smooth, but very unrealistic. (under stock rules, even with the double damage on crit, you can't kill an NPC with a .22acp in one shot... you will not be able to cross the 20 point threshold; NPC's die at 21 points of damage, and even with x4 (x2 head, x2 crit), 1d6-1 maxes at 20.
T4: Too many botches, and nearly as badly edited as MT, plus Chris Foss art, a lack of real love of the system, and FF&S carrying forward its failures tech-wise and adding more, plus the printing error making the formulae hard to work...
GT: First, it is GURPS. Second, it makes numerous small changes and assertions of hotly debated points. Third, it is a wholly incompatable set of mechanics for many things. (most annoying is the GURPS $... it's GURPS consistant, but it is NOT 1:1 for the imperial Cr... and moreover, there isn't even a good straight-line comparison.)
T20: Not out yet; in playtest. Playable, but somewhat more limited than other editions. waiting and hoping to help make it the best traveller available.
Each set of rules has very different combat results (MT and CT are the closest to each other in results; CT and T4 second.) Each rule set had different ship design parameters, too, which also changes the setting. (Heck, CT had TWO, and so did T4).
I feel the nature of CT was clearly a cinematic setting. MT was more realistic (except for the aforementioned armor issue); it did, however, make for just as swashbuckling a setting due to non-mechanical considerations, and the mechanics were easily adaptable for more cinematic feel. TNE went too far; beyond cinematic in personal combat (almost to the chambara level); very realistic space combat mechanics, with space-opera ranges... I could see Lensman-TNE. (in fact, I've nearly done just that before.) T4 has a cinematic feel, to, but much more "Die Hard" than "Enter the Dragon".
but all are cinematic to some degree.
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-aramis
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