I'm sorry I misunderstood. You said "Most of the naming seems to be okay in matlab but sometimes it would be nice if you could tab and see a list of matches.",

I'm sorry I misunderstood. You said "Most of the naming seems to be okay in matlab but sometimes it would be nice if you could tab and see a list of matches.", and I still don't quite see how I could have parsed that as "Mathematica doesn't have tab completion", but no matter. Yes, the one-function-per-file rule in MATLAB is horrible. (Of course you can have one class per file and define many methods there, if you want.) As is just about everything else about MATLAB-qua-programming-language.