mistrustful - having doubts about the honesty or abilities of someone
suspicious
effective
succesful
complicated
complex
over-confident
arrogant
cautious -taking care to avoid danger or bad situations
wary - not completely trusting or certain about something or someone
costly
expensive
unsuccessful
ineffective - not producing the effects or results that are wanted
practical
functional
Reliable
trustworthy - Someone who is trustworthy can be trusted.
simple
modest
positive
favourable - showing that you like or approve of someone or something
showy - attracting a lot of attention by being very colourful or bright, but without any real beauty
ostentatious -too obviously showing your money, possessions, or power, in an attempt to make other people notice and admire you