It's really an open question. Alot of people will tell you to use C++, cause that's what the hardcore pros use for big commercial games like WoW, but it really comes down to what language YOU are most comfortable using or learning. For me it's VB, cause it's easy to pickup and isn't that bad if you use it right. Is it meant for big commercial games scenarios? No, but it's a good way for me to get my foot in the door of the programming world.
Thanks for the replies. I was mainly wondering because I was looking to hire someone to make an engine to support the criteria I had listed. I'm an info systems major so I've word a bit with each of the ones ya'll have listed. So whatever would be the best combination for price quality and accessibility is the way I want to go.
grimsk8ter11
Unregistered
Java is probably your best bet for cross platform support unless you write in pure C or C++.
Well there are plenty of choices, I wouldn't recommend VB6 for Such MMORPGs that require Fast proccessing. VB6 is a good choice for other things.
However things i do recommend are:
C++/Qt(C++ can be easy to understand if you learn it in a method that you find intrests you, Qt makes C++ code portable and makes coding in it slightly easier)
.NET(Any .NET language will do, theire all mostly the same except F#. Theire pretty easy and you can rapidly make applications in it, and Mono makes it available on many platforms, however .NET may seem intimidating at first.)
Game Maker(I'm not sure how good it preforms with high numbers of players, but when 2D is you're thing this is an Excellent application, Not cross-platform but it's really easy to get started and is a fun way of doing things.)
Other BASIC variants(There are so many i can't count, Some are easier to code it, Some are more powerful and some are easier to program games in, Google them.)
Python/Lua(Both Interpreted languages, however Python is an Amazing little language and is quite powerful, a little slow and crossplatform. Lua is also very easy and used by many mainstream games for Scripting, can also be compiled with LuaJIT and you can use many Libraries with it.)
Just pick something you like, i didn't list everything, but I hope i helped.