I'm glad you got into the franchise! I really got hours of joy out of playing TR myself. And, yes, definitely, sequels were indeed getting progressively worse. TR: Legend was probably the turning point when TR got back on course.
Still, I'm actually looking to pick up TR 1 - 6 for the PC at some stage. Eidos published a package with all six games some years ago but it seems to be out of print, unfortunately.
I've got some joypads for the PC as well (makes playing old console stuff that much more fun
), so they'll come in handy once I've picked those games up.