The games changes don't feel to arbitrary, and I always feel like I am re-learning the game, but it is a new and good game every time.
The latest patch has me a bit off kilter, I used to play 3 hours a night, now I am lucky to get an hour in a day, usually less, and many times none.
But, I still haven't figured out what the "best" mechs are for me.
Though i still love the Morrigu the most, the Vulture B has grown on me, and with the damage weighted scoring that has come through, it has been AWESOME!
I just found a new love for the Madcat with 2 erlbls 5 medium lasers and a gaus.
That is one of the interesting things in the 4.0 releases.
Every time I find _THE_ mech for me, something kills me and changes my world view.
For a while I was absolutely in love with the ATM 9 Puma, then I found that getting into close combat made it suck.
Then I fell in love with the Madcat with 2 atm 12, until I was beaten by a close range shadowcat

But each map actually has its differences, and I am starting to learn there is not a one size fits all.
It used to be I would get up and buy a Novacat, then it was game over. For the enemy because it was so one sided, for me because I always went straight to Novacat.
Now if you always try to take one mech, you will get something to counter you, and thats what I really like.