I'm a new player currently using a long sword as my main. I now just read on reddit (the survey) about how people dislike playing with other players using the long sword.
How big of an issue is this? I'd rather not annoy people, and it's probably not too late to switch to another main (GS, maybe).
It's never too late to pick up a new weapon. Knowing multiple weapons is always an advantage since some weapons are better against certain monsters than others. Case in point: I was a longsword user for 50+ hours in MHF2 before I tried out hammers. The game immediately went from 'this is ok but too hard' to 'THIS IS AWESOME I AM DEATH INCARNATE'
The Longsword stigma is because of their tendency to trip up players online with their wide sweeping spammy attacks. Learn your moveset, don't mash while hoping the monster will stagger, and understand the range of your attacks.
GS is a tough weapon to handle for a new player, but if you can figure it out you can play pretty much anything. Although you should already understand the basics of draw attacks and sheathing from using your LS. I'd actually recommend trying out hammers first to get a handle on the charge attacks.
It's a fluffy kitten compared to MHFU Tigrex.
Nah, P3rd was the fluffy kitten. This one has some new moves and is more unpredictable. MHFU Tigrex was really easy if you used a GS or hammer and didn't go into the fight with negative dragon resist.