A Maniratnam film always has a "solid" base for human relationships and this film isn't different in that aspect. Where it differs is the story narration - that is less verbose, more visual(and cryptic). The Characters (VC & Dr.Leela) seems to be well thought- out (but defined more through visual cues & motifs). The director has focused more on reflecting the "moments"(What happens) - of their love, togetherness and conflicts than elaborating their story(and the Whys).. These moments give a trajectory that's sinusoidal. The final culmination (climax) might seem out-of-place for many, but for me that an organic end (where the characters seem to resolve their conflicts within and with the other, and end-up together,at least that moment).. This movie is definitely a visual treat and will stand-out as a classic(though it doesn't appear so today)
P.S: If Karthi's(VC) acting has irritated you, then the character has achieved its purpose(the same goes with you ending up adoring Dr.Leela -Aditi).How these opposites connect is a phenomenon(you call it love or whatever) that's mystical, not logical.. And the movie just reflects that.