I love this thread already... I'm going to let the hate flow:
I love how amarok takes a stab at assigning album art based on amazon listings. When it doesn't find the exact match, it gives me choices. Definitely preferable to the all or nothing approach that iTunes uses.
I hate the ambiguity in iTunes between "import" and "add to library". Further, I hate how frequently, even if something is marked as part of a compilation, it isn't represented as such. Fixing it is usually a matter of using a third-party tagger. Not cool. Also, and I'm not sure if this is the case or not, but it seems that alterations made to ID3 files in iTunes don't survive importation to other programs to play music. I'll let everybody know if this is the case when I run amarok 2 for the first time on my macbook.
I love VLC for its out-of-the-box codec support. I have moved on to Mplayer because I like its controls better, but I shudder when I think of my video viewing life before VLC.
I hate every cell phone user interface I've ever encountered.I have yet to doodle around with an iPhone, but everything I've ever used-- across provders, manufacturers, and years-- they all suck universally. Bad voice dialing, bad bluetooth implementation, too many menus to get to where I want to go, not enough features without paying extra. I patiently await an affordable, better than an iPhone phone.
I hate little LED lights on everything. Its bad enough that most of my stuff is drawing power while its "off". Its beyond tolerable that it has to let me know by blinking, or glowing at me in an otherwise dark room. My LCD tv has a very bright blue oval when its off, and nothing when its on. What sense does that make? If I wasnt afraid of damaging the screen, I'd take it apart and disable it. The macbook does the same thing when it goes on to standby-- a throbbing white light at eye level while I sleep. Call me strange, but I find this all very off-putting in a dark room.
I love greasemonkey and adblock. I hope an ad and nag-free internet isn't something from the golden age that I'll be telling my kids about. My installed scripts have already addressed most of the things that would have made this list (dictionary popups in the online new york times, for one).
I hate my new microwave oven's controls. I was spoiled by a very simple layout on the old one. With this one, I haven't even figured out how to set a proper cooking time on the thing yet. Nobody uses anything but full power, microwaves in restaurant kitchens just have a big dial. Keep it simple, stupids. Nobody is going to use the "broccoli" setting.