allow me to rephrase it in the proper way:
until 76 and beyond, Gladiator is superior in every aspect except chasing people on long distances( not a joke ).
Later on Tyrant learns rush and his own hex, wich gives him a chance to finally be able to kill Necros before getting debuffed and nuked into oblivion. Force Barrier helps as well.
i'm not saying that to be an asshole anyway, you can just look at any Oly videos on youtube and see for yourself how they do in PvP.
mind that i'm not saying that tyrants are a bad class, since they may be actually quite fun to play if you know how to use them properly.
but comparing them to a Gladiator is like comparing a paper plane with an F-16. you just don't do that.
now, for all that matters:
-Gladiator is currently a top-tier class that's high up in the food chain, second only to DA, Necro and Shamans due to lack of Fear skills;
-it is very versatile, you can play with any dyes you want based on what you prefer to do/how you want to do it, be it PvE or PvP, solo or group;
-it is a class designed for solo/group PvP. in mass PvP you're basicly locked at the usual 600 range limit for melees, so unless you bring a bow with you, you'll run out of mp fast and become pretty much useless. your job in mass PvP is basicly to keep your mana in order to chase down nukers and healers if they're retreating, otherwise you have no other role in that;
-in 2.0 they'll become even more dangerous than what they actually are due to new skills for damage/debuffs resistance, wich will push them even more to the top, second only to DA;
-it's not an easy mode class. despite of what most people think, if you don't learn how to manage sonic forces and skills rotations from early 40s, chances are you'll end up with no mana before killing anything, and you won't manage to survive against Gladiators that know what they're doing.
as for the main thread question: forget about all of what's written above, and play what you prefer. learn how to play it properly, and you'll be just fine.
there's nothing worse than playing lineage 2 with a class you don't like, nor care about.