Mutant X`s first two seasons were pretty good (in my opinion) until at the end of seson two when Emma died. And Lexa replaced ger in season three. Who was the son of a b***h who had that stupid idea. I liked Lexa, but I think Emma was better in that role. If you get over that you found another problem: after season three there is no other season, after season three ends quite strange and which makes you put yourself a lot of questions like "Well I didn`t understand that...What`s going on next?".
In conclusion I can say that Mutant X was just a unoriginal tv show without an end.