RCTgo

There is a difference between leaning towards well-made entries made in certain games and voting for an entry simply because it was made in a specific game. The bias that people have been complaining about recently is the latter.

I use RCT2 far more often than any of the others, so I generally prefer rounds where I get to see at least one high-quality RCT2 entry. Round 270 was Christmas. However, I will only vote for a RCT2 entry if I believe it's the best entry that round. If, after reviewing each entry, I conclude that the RCT3 entry is the best that round, or the NL2 entry or the Planet Coaster entry, I will vote for that one. If there is a tie in quality, I have swung both towards and against RCT2 in the past. 

While those who give feedback in voting threads will generally look at each entry carefully, there is a tendency for silent voters to vote towards 3D entries, namely RCT3 entries, regardless of quality. It has happened several times in the past year that an average RCT3 entry (compared even to other RCT3 entries) has beaten a high-quality RCT2 entry, and it also seems to happen every now and then that a higher-quality RCT2 entry will beat an average or even mediocre RCT3 entry, but only by a few votes. This is mainly what people have been complaining about when they refer to the "3D bias" in Build It.

In the past 20 rounds, RCT3 and other 3D entries have only won because they were the best entry that round, so the bias isn't as influential as it once was.