Just want to open here this thread that has been very popular on US Battle.net forums.
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So, let me start.
1) Star Wars: The Old Republic
We had been waiting for KotOR 3 for many years. When I first heard that it would going to be a MMO, I thought they were kidding (even checked the date, but no, it wasn't April 1). Then they gave hundreds of promises that story component of this game would be not worse than in previous two games. And they lied, terribly... Grinding MMO, that's what this game has become.
2) Age of Empires 3
AOE 1 and 2 were my favorite RTS before Warcraft 3 came. We knew that they were working hard on the next game, which, unlike AOE 2 - that was made in, what, 2 years? - would have long years of development and, hence, even better quality than the first two games. Needless to say, I removed the game the day I installed it. Never felt like playing it again. The game is just... Terrible.
3) Heroes of Might and Magic 4
HoMM 3 is classics, many people still play it (and I do sometimes). They promised that HoMM 4 would be the most popular game ever, with excellent graphics, many innovations, etc. But the game proved to be an abomination. Graphics was outdated and just, honestly, ugly; new ideas, like mobs patrolling the map and heroes participating in battles as units, were implemented horribly and absolutely unbalanced.
I removed the game the next day after I bought it. Tried many times to come back to the game ever since, but...
4) Doom 3
Doom and Doom 2 were of these games that are made once and forever, popular even 20 years after release. Of course, everyone expected Doom 3 to be, at least, as cool as these games. But, I just hated the game and played it only for a few hours and quit. All those elements that made Doom what it was - incredible level design, so that every level was basically a big puzzle you need to solve: find buttons, secrets, escape "doors of death", look for bottles of health, etc.; many humorous levels with Easter eggs, even two levels from Wolfenstein 3D!; steep learning curve, that makes the hardest difficulty virtually impossible, until you've practiced long enough - all this lacked in Doom 3. The game was not bad, it just was a different genre, not what Doom fans expected.
5) Supreme Ruler: Cold War
I love grand strategy games, and this one was promised to have the most complex economical, political and diplomatic system ever. The developers hold on on their promises and made the game that was, really, very complex in every mentioned aspect, and also featured quite a good AI. The only problem is... After 5 years in game it starts lagging so hard that, even on max speed, 1 in-game day lasts about 1 real-life minute. So a year lasts over 6 hours during which you have basically nothing to do, as major decisions are made only once a few weeks or so.
For some reason, developers didn't take into account that splitting one army into 1000 smaller armies requires 1000 more computer resources to handle it, and AI keeps resplitting its armies all the time, in every country, in every province.
The game also had some other problems, particularly a lot of bugs with Industrialization goods that simply disappeared from the game, leaving countries depending on it non-viable after a few years. But it didn't matter that much, as the game became unplayable soon after start.
Last I've heard, they partially solved that problem in the latest patch, speeding the game up to 5 times in some cases. But... First impression is a very strong one. Haven't touched the game since a few days after its release.