Yeah, if you're player isn't pulling the extended data of the Master Audio from the track, you're only getting the 1.5 Mbps basic DTS.
That may be slightly better than DVD, even though the original DVD spec called for 1.5 Mbps DTS, most content producers didn't want to give up that much of the 10 Mbps total mux rate (which is used by additional languages and subtitles, even when they're off), so DTS made a reduced rate 768 Mbps version of the format. That is what is usually used on DVDs that have a DTS track. But the Master Audio track contains a full 1.5 Mbps core on BDs. That's still a far cry from lossless though.
