I actually quiet enjoyed the Clix game when it came out and honestly had a lot of charm. Of course the main problem it had was major power creep plus the whole Cracking Packs aspect of it. I remember some of the more meta pieces going around for 50 bucks online back in the day.
I think the three biggest problems with ClickyTech were:
1) The blind boxes. I tried it a few times and kept getting crap like multiple LawnmowerMechs while my friends kept getting real Mechs. After about five boxes of that I just gave up on buying anything new.
2) It didn't translate well to BT. They came out with a Record Sheets book for them and some of the designs that were great with the click bases just sucked in BT. Things like a long range mech in ClickyTech ended up being armed with AC2s as their main weapons which just doesn't work. I know that Weisman had intended that BT die out and didn't care, but had it been designed to be able to translate from one to the other would have been nice, but it would have required Weisman to care about keeping BT in the first place.
3) Power creep was fully intended from the start. That way you have to keep buying the newest set and tossing the older stuff to stay competitive.
I liked some aspects of the game. I liked the emphasis on combined arms. I liked that it started with wannabe units in the ROTS (Swordsworn, Spirit Cats, etc.) and ended up with them being absorbed by their appropriate House or Clan (Davion, Nova Cats, etc.). I liked that it was quick, the rules were straight forward, I liked how much effort they put in for expanding their setting (the Touring the Sphere articles online and pilot cards features for example).
I think Weisman made some terrible decisions going into it and mostly it came down to his piggybacking on the planned Jihad and how the survivors just gave up their Mechs (the basis of their own smaller nobility power according to all the fluff we'd seen for ages), the crashing of the HPG network (a mystery that has still never been solved 20 years of real time later), and telling the fanbase to kick rocks if they weren't on board with his direction for the game itself and the new setting. I'm glad WizKids did allow BT to still exist in some manner and then to start moving forward in time.
ClickyTech must have done something right since it sold well for 6 or 7 years.