Politics.
Not everyone agrees with Ulfric and his view of the world.
The legion has always offered a good career for Orcs. Orcs in turn make good professional soldiers. Follow orders, do your duty, shed some enemy blood; it doesn't get any better than that.
Really, there's nothing more to say here, unless the goal is to be inflammatory.
Question: "Why might a someone choose cake over pie?"
Reasonable answer: "They prefer it."
Typical gamesas Forums answer: "They are a mindless twit."
Wow.
I blame the drugs.
As for Nords joining the Legion...
Ulfric's 'agree with me in all ways or I'll kill you if I come to power' stance is not universally endearing.
A united Empire may well be the only way out from under the elven heel.
Personal loyalty to one of the Jarls that isn't siding with Ulfric.
Belief that using the voice in a duel was dishonorable.
Lost a family member when Ulfric 'solidified his support' in Markarth.
Hates the Silverbloods and considers Ulfric their lapdog, or vice versa.
Supports the other guy in Windhelm.
Has a hot Breton girlfriend and thinks Ulfric is a racist.
Has a hot Dunmer girlfriend and is sure Ulfric is a racist.
I think there are two perspectives that are important to differentiate between when talking about this: The meta-perspective that is in use when the sides are being discussed on the forums, and the in-world perspective of the character in question. It is unreasonable for any character to have nearly as good an overview as our meta-perspective.
From a meta-perspective, I don't see any reason for anyone to join the Emprie. There was one somewhat compelling reason, but then they added a certain questline in the game and I cannot for the life of me see how anyone can reconcile that with the Empire being the better option. But I'm not getting into that in any detail here.
The in-world perspective allows for decent enough reasons for a Nord to join the Empire. "Remaining united = for the best" is a very instinctive reaction for many people. Maybe this individual thinks that the Empire is still a good thing for Skyrim. Maybe there is a family tradition in joining the Legion. Maybe they believe that it is worth fighting for Talos' physical legacy. Maybe they believe that the Stormcloaks are making things worse by endangering the peace the Empire sacrificed so much for. Or any combination of these.
I use Live Another Life, so my characters don't have that execution business to hold a grudge over.
Interesting...for me this is the total reverse of my thinking. I pick out what I want a particular character to do, then come up with reasoning and background that fits.
Because Rikke is the most reasonable Nord in that whole thing.
CCNA's right. My Nord joined because he disagreed with Ulfric, plain and simple. He merely thought Ulfric was too rash in his efforts and decided to either trust that the Empire can find some way to circumvent the Thalmor's decrees or wait until a better leader comes along.
No proof required. As long as the character involved believes it his joining the legion is a pretty natural outcome.
ha true, I would love to start out as someone other then a prisoner sometime but Xbox and all that console crap
So you serve the Legion who is there enforcing Aldmeri law alongside the Thalmor?
The Thalmor put a whole new meaning on the word "racist" and the Legion lets/helps it happen.