Microtransactions in paid-for games.
Games that are broken on release. I'll wait for the patched version, thanks.
Pre-order exclusive DLC. I really don't care about the exclusive gun/swimsuit costume that comes with it, I'm not buying at your shop because of it.
FTP games where progress is gated behind timers or cash rather than skill. I'm not opposed to FTP in principle, just the ones that make their game a boring whalehunt for people who don't want to pay out more in total than they would have for any other game. If an FTP title looks like it isn't happy with me throwing it a few quid because I'm having fun rather than paying to avoid frustration, the developers can sod off. No, your cheap Clash of Clans knockoff isn't worth me spending more than a tenner on it.
Mobile games that require always-online. If I can't play it on the train, I'm not interested.
While I'm not personally interested in Amiibo/Skylanders etc, I'm not opposed to them in principle, they are toys and just aren't aimed at me. There's a difference betwen stuff I wouldn't buy anyway and stuff I actively choose to avoid. Same goes for AC/CoD etc.
Season passes are another one I avoid not because I'm opposed to the concept, but because they are invariably poor value. It seems silly to give a developer your cash months in advance for multiple products with no idea of which ones will be any good, when the complete game will be discounted a year later anyway. Particularly with Telltale's games where the season pass costs £20 but shortly after the last episode is released, you can buy the season for £7 in the sales. Season passes should be much, much cheaper considering the trust they demand and the uncertainty of quality and release dates they entail, rather than the tiny discount they usually offer.