Disclaimer, to quell the potential flames thrown in my direction.

I LOVE the game, and I'm very glad I bought direct from the devs the day it came out (soundtrack too). HOWEVER...
Those people saying luck is too much of a factor? Well it's really hard to disagree. All of the arguments against this that I've read revolve around the fact that you know where stuff is, you know when you're going to get that important gear and that you KNOW what's just around the corner.
You don't though. And that's fine, and as it should be. It wouldn't be much of a rougelike if you could predict exactly how a game is gonna go. I've had a situation where I deliberately went for the "Tough Little Ship" achievement on a whim, and honestly thought I was gonna lose quickly after that. I ended up getting to the boss and getting to the second phase!
But more often than not the game will dump stuff on you that you have no way to deal with, and could not possibly have prepared for, especially (as has been mentioned before) it's EXTREMELY hard to prepare for everything. Boarding parties are a common example. Small teams of two or three, they're tricky but workable. A team of 5 mantis men however? With no means to stop it? Or have any idea it was coming beyond "they're here now, enjoy!"? Yes they're technically possible to deal with (I've done it once) but generally that's a big fat game over, because of a situation you had no control over whatsoever.
Now take a game like The Binding Of Isaac (mostly since that's the only other rougelike I've played so far). For the most part, the game rarely puts you in situations you can't deal with. Unless you've been EXTREMELY unlucky with the drops, all the enemies can be dealt with if you have the skill to fight them off. You don't know exactly what's coming around the corner, but you can take an educated guess based on past experience. It's much harder to do that in FTL beyond "don't go after the alien spiders" or "wait for a blue option". This encourages a more cautious style of game play, but in my experience that's not going to get you very far. I know I've lost a couple of times because I tried to minimise my risks, and thus minimise the number of auto-lose encounters I get.
The other thing TBOI does right in terms of what to expect is unlocks. Drops are random, but you have just as much chance of getting them one game as you do another. Unlocks here are also extremely luck based. Didn't find the random sector a ship unlock quest starts in? Sorry, maybe next time! If one or two of the ships were like this, such as the secret ship, that'd be fine. But most of the ships (bar the Engi ship and Federation cruiser) are locked off to you until you arbitrarily stumble upon the right sector before the Rebels catch up to you.
To counter the negativity here I wanna go into things I think FTL does right, if only to prove I'm not just here to bash the game.
Back onto unlocks, whilst I really dislike that lots of the ships are completely unavailable to you unless you happen to stumble into the right sector (with no indicator of where may be the best place to go), I do like that the Type B ships are for the most part skill based with achievements. You know exactly what you need to do, and can plan your game accordingly (since mercifully you don't need to beat the game to keep the unlock

). This is how I got the Type B Kestral. It feels a lot fairer than blindly groping in the dark.
Game length is something that I feel is very good as well, especially combined with how random good chunks of the game are. At the most you're probably gonna take an hour to get to sector 8, and this means that you're always gonna be able to get a good game in a short sitting. This is something TBOI doesn't do as well, especially as every time you beat it (more or less), it gets even longer. And you can't even save to carry on at a later time (something else FTL does right!).
And finally the bread and butter of the game, the combat, is stellar. Combat situations are definitely fair, usually. I've never gotten into a combat that I felt I couldn't recover from, even if it means jumping away. Well, there are two exceptions, those being that I had a hard time finding missiles for the final boss (but even that was mostly my fault, I sold a Heavy Ion Cannon eariler. Big mistake

), and when you're being shot at whilst being attacked by a larger boarding party (but that's mostly due to me not being very well practiced at micro).
And that's kind of why the random encounters you have no way of assessing until it's too late irk me a little (and I imagine the others who have a problem with luck in the game). The main, skill based part of the game is fine. You can usually deal with a lot of what's thrown at you combat wise, but then you can get shot in the foot by an event you had no control over AT ALL.
So I hope I've explained the "too much luck" stance without looking like I'm just bashing the game. As I say, I love it and I will continue to sink more hours into it, but if there was anything I'd change it would be the random backstabbing the game can give you if it feels like it. Well that and the inability to trade fuel, missiles and scrap at stores, but hey.
