Its something thats hard to quantify.
To me its like Team 17 games are made by men in suits who have discovered the formula of how to create games.
They have everything going for them except charisma or soul or that certain something that makes truly great games more than just the sum of their parts.
I also find their main characters to be extremely dull:
Superfrog - a Super Frog? the only reason this character has any personality at all is down to Eric Schwartz
Alien Breed - are these identically cloned characters even named?
Assasin - who?
Body Blows - painfully unoriginal and instantly forgettable
Full Contact - again painfully unoriginal